diff --git a/fennel b/fennel
index d7f3dd9..c3c8d46 100755
--- a/fennel
+++ b/fennel
@@ -1,28 +1,39 @@
 #!/usr/bin/env lua
+-- SPDX-License-Identifier: MIT
+-- SPDX-FileCopyrightText: Calvin Rose and contributors
 package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(...)
   local fennel = require("fennel")
-  local _770_ = require("fennel.utils")
-  local copy = _770_["copy"]
-  local warn = _770_["warn"]
+  local _782_ = require("fennel.utils")
+  local copy = _782_["copy"]
+  local warn = _782_["warn"]
   local function shellout(command)
     local f = io.popen(command)
     local stdout = f:read("*all")
     return (f:close() and stdout)
   end
   local function execute(cmd)
-    local _771_0 = os.execute(cmd)
-    if (_771_0 == 0) then
+    local _783_0 = os.execute(cmd)
+    if (_783_0 == 0) then
       return true
-    elseif (_771_0 == true) then
+    elseif (_783_0 == true) then
       return true
     end
   end
   local function string__3ec_hex_literal(characters)
-    local hex = {}
-    for character in characters:gmatch(".") do
-      table.insert(hex, ("0x%02x"):format(string.byte(character)))
+    local _785_
+    do
+      local tbl_17_ = {}
+      local i_18_ = #tbl_17_
+      for character in characters:gmatch(".") do
+        local val_19_ = ("0x%02x"):format(string.byte(character))
+        if (nil ~= val_19_) then
+          i_18_ = (i_18_ + 1)
+          tbl_17_[i_18_] = val_19_
+        end
+      end
+      _785_ = tbl_17_
     end
-    return table.concat(hex, ", ")
+    return table.concat(_785_, ", ")
   end
   local c_shim = "#ifdef __cplusplus\nextern \"C\" {\n#endif\n#include <lauxlib.h>\n#include <lua.h>\n#include <lualib.h>\n#ifdef __cplusplus\n}\n#endif\n#include <signal.h>\n#include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n\n#if LUA_VERSION_NUM == 501\n  #define LUA_OK 0\n#endif\n\n/* Copied from lua.c */\n\nstatic lua_State *globalL = NULL;\n\nstatic void lstop (lua_State *L, lua_Debug *ar) {\n  (void)ar;  /* unused arg. */\n  lua_sethook(L, NULL, 0, 0);  /* reset hook */\n  luaL_error(L, \"interrupted!\");\n}\n\nstatic void laction (int i) {\n  signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */\n  lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);\n}\n\nstatic void createargtable (lua_State *L, char **argv, int argc, int script) {\n  int i, narg;\n  if (script == argc) script = 0;  /* no script name? */\n  narg = argc - (script + 1);  /* number of positive indices */\n  lua_createtable(L, narg, script + 1);\n  for (i = 0; i < argc; i++) {\n    lua_pushstring(L, argv[i]);\n    lua_rawseti(L, -2, i - script);\n  }\n  lua_setglobal(L, \"arg\");\n}\n\nstatic int msghandler (lua_State *L) {\n  const char *msg = lua_tostring(L, 1);\n  if (msg == NULL) {  /* is error object not a string? */\n    if (luaL_callmeta(L, 1, \"__tostring\") &&  /* does it have a metamethod */\n        lua_type(L, -1) == LUA_TSTRING)  /* that produces a string? */\n      return 1;  /* that is the message */\n    else\n      msg = lua_pushfstring(L, \"(error object is a %%s value)\",\n                            luaL_typename(L, 1));\n  }\n  /* Call debug.traceback() instead of luaL_traceback() for Lua 5.1 compat. */\n  lua_getglobal(L, \"debug\");\n  lua_getfield(L, -1, \"traceback\");\n  /* debug */\n  lua_remove(L, -2);\n  lua_pushstring(L, msg);\n  /* original msg */\n  lua_remove(L, -3);\n  lua_pushinteger(L, 2);  /* skip this function and traceback */\n  lua_call(L, 2, 1); /* call debug.traceback */\n  return 1;  /* return the traceback */\n}\n\nstatic int docall (lua_State *L, int narg, int nres) {\n  int status;\n  int base = lua_gettop(L) - narg;  /* function index */\n  lua_pushcfunction(L, msghandler);  /* push message handler */\n  lua_insert(L, base);  /* put it under function and args */\n  globalL = L;  /* to be available to 'laction' */\n  signal(SIGINT, laction);  /* set C-signal handler */\n  status = lua_pcall(L, narg, nres, base);\n  signal(SIGINT, SIG_DFL); /* reset C-signal handler */\n  lua_remove(L, base);  /* remove message handler from the stack */\n  return status;\n}\n\nint main(int argc, char *argv[]) {\n lua_State *L = luaL_newstate();\n luaL_openlibs(L);\n createargtable(L, argv, argc, 0);\n\n static const unsigned char lua_loader_program[] = {\n%s\n};\n  if(luaL_loadbuffer(L, (const char*)lua_loader_program,\n                     sizeof(lua_loader_program), \"%s\") != LUA_OK) {\n    fprintf(stderr, \"luaL_loadbuffer: %%s\\n\", lua_tostring(L, -1));\n    lua_close(L);\n    return 1;\n  }\n\n  /* lua_bundle */\n  lua_newtable(L);\n  static const unsigned char lua_require_1[] = {\n  %s\n  };\n  lua_pushlstring(L, (const char*)lua_require_1, sizeof(lua_require_1));\n  lua_setfield(L, -2, \"%s\");\n\n%s\n\n  if (docall(L, 1, LUA_MULTRET)) {\n    const char *errmsg = lua_tostring(L, 1);\n    if (errmsg) {\n      fprintf(stderr, \"%%s\\n\", errmsg);\n    }\n    lua_close(L);\n    return 1;\n  }\n  lua_close(L);\n  return 0;\n}"
   local function compile_fennel(filename, options)
@@ -39,13 +50,13 @@ package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(
   local function module_name(open, rename, used_renames)
     local require_name = nil
     do
-      local _774_0 = rename[open]
-      if (nil ~= _774_0) then
-        local renamed = _774_0
+      local _788_0 = rename[open]
+      if (nil ~= _788_0) then
+        local renamed = _788_0
         used_renames[open] = true
         require_name = renamed
       else
-        local _ = _774_0
+        local _ = _788_0
         require_name = open
       end
     end
@@ -84,14 +95,14 @@ package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(
     local dotpath = filename:gsub("^%.%/", ""):gsub("[\\/]", ".")
     local dotpath_noextension = (dotpath:match("(.+)%.") or dotpath)
     local fennel_loader = nil
-    local _778_
+    local _792_
     do
-      _778_ = "(do (local bundle_2_ ...) (fn loader_3_ [name_4_] (match (or (. bundle_2_ name_4_) (. bundle_2_ (.. name_4_ \".init\"))) (mod_5_ ? (= \"function\" (type mod_5_))) mod_5_ (mod_5_ ? (= \"string\" (type mod_5_))) (assert (if (= _VERSION \"Lua 5.1\") (loadstring mod_5_ name_4_) (load mod_5_ name_4_))) nil (values nil (: \"\n\\tmodule '%%s' not found in fennel bundle\" \"format\" name_4_)))) (table.insert (or package.loaders package.searchers) 2 loader_3_) ((assert (loader_3_ \"%s\")) ((or unpack table.unpack) arg)))"
+      _792_ = "(do (local bundle_2_ ...) (fn loader_3_ [name_4_] (match (or (. bundle_2_ name_4_) (. bundle_2_ (.. name_4_ \".init\"))) (mod_5_ ? (= \"function\" (type mod_5_))) mod_5_ (mod_5_ ? (= \"string\" (type mod_5_))) (assert (if (= _VERSION \"Lua 5.1\") (loadstring mod_5_ name_4_) (load mod_5_ name_4_))) nil (values nil (: \"\n\\tmodule '%%s' not found in fennel bundle\" \"format\" name_4_)))) (table.insert (or package.loaders package.searchers) 2 loader_3_) ((assert (loader_3_ \"%s\")) ((or unpack table.unpack) arg)))"
     end
-    fennel_loader = _778_:format(dotpath_noextension)
+    fennel_loader = _792_:format(dotpath_noextension)
     local lua_loader = fennel["compile-string"](fennel_loader)
-    local _779_ = options
-    local rename_modules = _779_["rename-modules"]
+    local _793_ = options
+    local rename_modules = _793_["rename-modules"]
     return c_shim:format(string__3ec_hex_literal(lua_loader), basename_noextension, string__3ec_hex_literal(compile_fennel(filename, options)), dotpath_noextension, native_loader(native, {["rename-modules"] = rename_modules}))
   end
   local function write_c(filename, native, options)
@@ -104,28 +115,28 @@ package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(
   local function compile_binary(lua_c_path, executable_name, static_lua, lua_include_dir, native)
     local cc = (os.getenv("CC") or "cc")
     local rdynamic, bin_extension, ldl_3f = nil, nil, nil
-    local _781_
+    local _795_
     do
-      local _780_0 = shellout((cc .. " -dumpmachine"))
-      if (nil ~= _780_0) then
-        _781_ = _780_0:match("mingw")
+      local _794_0 = shellout((cc .. " -dumpmachine"))
+      if (nil ~= _794_0) then
+        _795_ = _794_0:match("mingw")
       else
-        _781_ = _780_0
+        _795_ = _794_0
       end
     end
-    if _781_ then
+    if _795_ then
       rdynamic, bin_extension, ldl_3f = "", ".exe", false
     else
       rdynamic, bin_extension, ldl_3f = "-rdynamic", "", true
     end
     local compile_command = nil
-    local _784_
+    local _798_
     if ldl_3f then
-      _784_ = "-ldl"
+      _798_ = "-ldl"
     else
-      _784_ = ""
+      _798_ = ""
     end
-    compile_command = {cc, "-Os", lua_c_path, table.concat(native, " "), static_lua, rdynamic, "-lm", _784_, "-o", (executable_name .. bin_extension), "-I", lua_include_dir, os.getenv("CC_OPTS")}
+    compile_command = {cc, "-Os", lua_c_path, table.concat(native, " "), static_lua, rdynamic, "-lm", _798_, "-o", (executable_name .. bin_extension), "-I", lua_include_dir, os.getenv("CC_OPTS")}
     if os.getenv("FENNEL_DEBUG") then
       print("Compiling with", table.concat(compile_command, " "))
     end
@@ -143,17 +154,17 @@ package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(
     if (version_extension and (version_extension ~= "") and not version_extension:match("%.%d+")) then
       return false
     else
-      local _789_0 = extension
-      if (_789_0 == "a") then
+      local _803_0 = extension
+      if (_803_0 == "a") then
         return path
-      elseif (_789_0 == "o") then
+      elseif (_803_0 == "o") then
         return path
-      elseif (_789_0 == "so") then
+      elseif (_803_0 == "so") then
         return path
-      elseif (_789_0 == "dylib") then
+      elseif (_803_0 == "dylib") then
         return path
       else
-        local _ = _789_0
+        local _ = _803_0
         return false
       end
     end
@@ -185,10 +196,10 @@ package.preload["fennel.binary"] = package.preload["fennel.binary"] or function(
     return native
   end
   local function compile(filename, executable_name, static_lua, lua_include_dir, options, args)
-    local _796_ = extract_native_args(args)
-    local libraries = _796_["libraries"]
-    local modules = _796_["modules"]
-    local rename_modules = _796_["rename-modules"]
+    local _810_ = extract_native_args(args)
+    local libraries = _810_["libraries"]
+    local modules = _810_["modules"]
+    local rename_modules = _810_["rename-modules"]
     local opts = {["rename-modules"] = rename_modules}
     copy(options, opts)
     return compile_binary(write_c(filename, modules, opts), executable_name, static_lua, lua_include_dir, libraries)
@@ -204,15 +215,16 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   local specials = require("fennel.specials")
   local view = require("fennel.view")
   local unpack = (table.unpack or _G.unpack)
-  local function default_read_chunk(parser_state)
-    local function _607_()
-      if (0 < parser_state["stack-size"]) then
-        return ".."
-      else
-        return ">> "
-      end
+  local depth = 0
+  local function prompt_for(top_3f)
+    if top_3f then
+      return (string.rep(">", (depth + 1)) .. " ")
+    else
+      return (string.rep(".", (depth + 1)) .. " ")
     end
-    io.write(_607_())
+  end
+  local function default_read_chunk(parser_state)
+    io.write(prompt_for((0 == parser_state["stack-size"])))
     io.flush()
     local input = io.read()
     return (input and (input .. "\n"))
@@ -222,18 +234,18 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return io.write("\n")
   end
   local function default_on_error(errtype, err, lua_source)
-    local function _609_()
-      local _608_0 = errtype
-      if (_608_0 == "Lua Compile") then
+    local function _613_()
+      local _612_0 = errtype
+      if (_612_0 == "Lua Compile") then
         return ("Bad code generated - likely a bug with the compiler:\n" .. "--- Generated Lua Start ---\n" .. lua_source .. "--- Generated Lua End ---\n")
-      elseif (_608_0 == "Runtime") then
+      elseif (_612_0 == "Runtime") then
         return (compiler.traceback(tostring(err), 4) .. "\n")
       else
-        local _ = _608_0
+        local _ = _612_0
         return ("%s error: %s\n"):format(errtype, tostring(err))
       end
     end
-    return io.write(_609_())
+    return io.write(_613_())
   end
   local function splice_save_locals(env, lua_source, scope)
     local saves = nil
@@ -241,7 +253,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
       for name in pairs(env.___replLocals___) do
-        local val_19_ = ("local %s = ___replLocals___['%s']"):format((scope.manglings[name] or name), name)
+        local val_19_ = ("local %s = ___replLocals___[%q]"):format((scope.manglings[name] or name), name)
         if (nil ~= val_19_) then
           i_18_ = (i_18_ + 1)
           tbl_17_[i_18_] = val_19_
@@ -256,7 +268,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       for raw, name in pairs(scope.manglings) do
         local val_19_ = nil
         if not scope.gensyms[name] then
-          val_19_ = ("___replLocals___['%s'] = %s"):format(raw, name)
+          val_19_ = ("___replLocals___[%q] = %s"):format(raw, name)
         else
         val_19_ = nil
         end
@@ -273,25 +285,25 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     else
       gap = " "
     end
-    local function _615_()
+    local function _619_()
       if next(saves) then
         return (table.concat(saves, " ") .. gap)
       else
         return ""
       end
     end
-    local function _618_()
-      local _616_0, _617_0 = lua_source:match("^(.*)[\n ](return .*)$")
-      if ((nil ~= _616_0) and (nil ~= _617_0)) then
-        local body = _616_0
-        local _return = _617_0
+    local function _622_()
+      local _620_0, _621_0 = lua_source:match("^(.*)[\n ](return .*)$")
+      if ((nil ~= _620_0) and (nil ~= _621_0)) then
+        local body = _620_0
+        local _return = _621_0
         return (body .. gap .. table.concat(binds, " ") .. gap .. _return)
       else
-        local _ = _616_0
+        local _ = _620_0
         return lua_source
       end
     end
-    return (_615_() .. _618_())
+    return (_619_() .. _622_())
   end
   local function completer(env, scope, text)
     local max_items = 2000
@@ -303,14 +315,14 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       local scope_first_3f = ((tbl == env) or (tbl == env.___replLocals___))
       local tbl_17_ = matches
       local i_18_ = #tbl_17_
-      local function _620_()
+      local function _624_()
         if scope_first_3f then
           return scope.manglings
         else
           return tbl
         end
       end
-      for k, is_mangled in utils.allpairs(_620_()) do
+      for k, is_mangled in utils.allpairs(_624_()) do
         if (max_items <= #matches) then break end
         local val_19_ = nil
         do
@@ -378,7 +390,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return input:match("^%s*,")
   end
   local function command_docs()
-    local _629_
+    local _633_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
@@ -389,18 +401,18 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
           tbl_17_[i_18_] = val_19_
         end
       end
-      _629_ = tbl_17_
+      _633_ = tbl_17_
     end
-    return table.concat(_629_, "\n")
+    return table.concat(_633_, "\n")
   end
   commands.help = function(_, _0, on_values)
-    return on_values({("Welcome to Fennel.\nThis is the REPL where you can enter code to be evaluated.\nYou can also run these repl commands:\n\n" .. command_docs() .. "\n  ,exit - Leave the repl.\n\nUse ,doc something to see descriptions for individual macros and special forms.\n\nFor more information about the language, see https://fennel-lang.org/reference")})
+    return on_values({("Welcome to Fennel.\nThis is the REPL where you can enter code to be evaluated.\nYou can also run these repl commands:\n\n" .. command_docs() .. "\n  ,return FORM - Evaluate FORM and return its value to the REPL's caller.\n  ,exit - Leave the repl.\n\nUse ,doc something to see descriptions for individual macros and special forms.\nValues from previous inputs are kept in *1, *2, and *3.\n\nFor more information about the language, see https://fennel-lang.org/reference")})
   end
   do end (compiler.metadata):set(commands.help, "fnl/docstring", "Show this message.")
   local function reload(module_name, env, on_values, on_error)
-    local _631_0, _632_0 = pcall(specials["load-code"]("return require(...)", env), module_name)
-    if ((_631_0 == true) and (nil ~= _632_0)) then
-      local old = _632_0
+    local _635_0, _636_0 = pcall(specials["load-code"]("return require(...)", env), module_name)
+    if ((_635_0 == true) and (nil ~= _636_0)) then
+      local old = _636_0
       local _ = nil
       package.loaded[module_name] = nil
       _ = nil
@@ -425,8 +437,8 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         package.loaded[module_name] = old
       end
       return on_values({"ok"})
-    elseif ((_631_0 == false) and (nil ~= _632_0)) then
-      local msg = _632_0
+    elseif ((_635_0 == false) and (nil ~= _636_0)) then
+      local msg = _636_0
       if msg:match("loop or previous error loading module") then
         package.loaded[module_name] = nil
         return reload(module_name, env, on_values, on_error)
@@ -434,32 +446,32 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         specials["macro-loaded"][module_name] = nil
         return nil
       else
-        local function _637_()
-          local _636_0 = msg:gsub("\n.*", "")
-          return _636_0
+        local function _641_()
+          local _640_0 = msg:gsub("\n.*", "")
+          return _640_0
         end
-        return on_error("Runtime", _637_())
+        return on_error("Runtime", _641_())
       end
     end
   end
   local function run_command(read, on_error, f)
-    local _640_0, _641_0, _642_0 = pcall(read)
-    if ((_640_0 == true) and (_641_0 == true) and (nil ~= _642_0)) then
-      local val = _642_0
-      local _643_0, _644_0 = pcall(f, val)
-      if ((_643_0 == false) and (nil ~= _644_0)) then
-        local msg = _644_0
+    local _644_0, _645_0, _646_0 = pcall(read)
+    if ((_644_0 == true) and (_645_0 == true) and (nil ~= _646_0)) then
+      local val = _646_0
+      local _647_0, _648_0 = pcall(f, val)
+      if ((_647_0 == false) and (nil ~= _648_0)) then
+        local msg = _648_0
         return on_error("Runtime", msg)
       end
-    elseif (_640_0 == false) then
+    elseif (_644_0 == false) then
       return on_error("Parse", "Couldn't parse input.")
     end
   end
   commands.reload = function(env, read, on_values, on_error)
-    local function _647_(_241)
+    local function _651_(_241)
       return reload(tostring(_241), env, on_values, on_error)
     end
-    return run_command(read, on_error, _647_)
+    return run_command(read, on_error, _651_)
   end
   do end (compiler.metadata):set(commands.reload, "fnl/docstring", "Reload the specified module.")
   commands.reset = function(env, _, on_values)
@@ -468,28 +480,28 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   end
   do end (compiler.metadata):set(commands.reset, "fnl/docstring", "Erase all repl-local scope.")
   commands.complete = function(env, read, on_values, on_error, scope, chars)
-    local function _648_()
+    local function _652_()
       return on_values(completer(env, scope, table.concat(chars):gsub(",complete +", ""):sub(1, -2)))
     end
-    return run_command(read, on_error, _648_)
+    return run_command(read, on_error, _652_)
   end
   do end (compiler.metadata):set(commands.complete, "fnl/docstring", "Print all possible completions for a given input symbol.")
   local function apropos_2a(pattern, tbl, prefix, seen, names)
     for name, subtbl in pairs(tbl) do
       if (("string" == type(name)) and (package ~= subtbl)) then
-        local _649_0 = type(subtbl)
-        if (_649_0 == "function") then
+        local _653_0 = type(subtbl)
+        if (_653_0 == "function") then
           if ((prefix .. name)):match(pattern) then
             table.insert(names, (prefix .. name))
           end
-        elseif (_649_0 == "table") then
+        elseif (_653_0 == "table") then
           if not seen[subtbl] then
-            local _651_
+            local _655_
             do
               seen[subtbl] = true
-              _651_ = seen
+              _655_ = seen
             end
-            apropos_2a(pattern, subtbl, (prefix .. name:gsub("%.", "/") .. "."), _651_, names)
+            apropos_2a(pattern, subtbl, (prefix .. name:gsub("%.", "/") .. "."), _655_, names)
           end
         end
       end
@@ -510,10 +522,10 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return tbl_17_
   end
   commands.apropos = function(_env, read, on_values, on_error, _scope)
-    local function _656_(_241)
+    local function _660_(_241)
       return on_values(apropos(tostring(_241)))
     end
-    return run_command(read, on_error, _656_)
+    return run_command(read, on_error, _660_)
   end
   do end (compiler.metadata):set(commands.apropos, "fnl/docstring", "Print all functions matching a pattern in all loaded modules.")
   local function apropos_follow_path(path)
@@ -533,12 +545,12 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     local tgt = package.loaded
     for _, path0 in ipairs(paths) do
       if (nil == tgt) then break end
-      local _659_
+      local _663_
       do
-        local _658_0 = path0:gsub("%/", ".")
-        _659_ = _658_0
+        local _662_0 = path0:gsub("%/", ".")
+        _663_ = _662_0
       end
-      tgt = tgt[_659_]
+      tgt = tgt[_663_]
     end
     return tgt
   end
@@ -550,9 +562,9 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       do
         local tgt = apropos_follow_path(path)
         if ("function" == type(tgt)) then
-          local _660_0 = (compiler.metadata):get(tgt, "fnl/docstring")
-          if (nil ~= _660_0) then
-            local docstr = _660_0
+          local _664_0 = (compiler.metadata):get(tgt, "fnl/docstring")
+          if (nil ~= _664_0) then
+            local docstr = _664_0
             val_19_ = (docstr:match(pattern) and path)
           else
           val_19_ = nil
@@ -569,125 +581,125 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return tbl_17_
   end
   commands["apropos-doc"] = function(_env, read, on_values, on_error, _scope)
-    local function _664_(_241)
+    local function _668_(_241)
       return on_values(apropos_doc(tostring(_241)))
     end
-    return run_command(read, on_error, _664_)
+    return run_command(read, on_error, _668_)
   end
   do end (compiler.metadata):set(commands["apropos-doc"], "fnl/docstring", "Print all functions that match the pattern in their docs")
   local function apropos_show_docs(on_values, pattern)
     for _, path in ipairs(apropos(pattern)) do
       local tgt = apropos_follow_path(path)
       if (("function" == type(tgt)) and (compiler.metadata):get(tgt, "fnl/docstring")) then
-        on_values(specials.doc(tgt, path))
-        on_values()
+        on_values({specials.doc(tgt, path)})
+        on_values({})
       end
     end
     return nil
   end
   commands["apropos-show-docs"] = function(_env, read, on_values, on_error)
-    local function _666_(_241)
+    local function _670_(_241)
       return apropos_show_docs(on_values, tostring(_241))
     end
-    return run_command(read, on_error, _666_)
+    return run_command(read, on_error, _670_)
   end
   do end (compiler.metadata):set(commands["apropos-show-docs"], "fnl/docstring", "Print all documentations matching a pattern in function name")
-  local function resolve(identifier, _667_0, scope)
-    local _668_ = _667_0
-    local env = _668_
-    local ___replLocals___ = _668_["___replLocals___"]
+  local function resolve(identifier, _671_0, scope)
+    local _672_ = _671_0
+    local env = _672_
+    local ___replLocals___ = _672_["___replLocals___"]
     local e = nil
-    local function _669_(_241, _242)
+    local function _673_(_241, _242)
       return (___replLocals___[scope.unmanglings[_242]] or env[_242])
     end
-    e = setmetatable({}, {__index = _669_})
-    local function _670_(...)
-      local _671_0, _672_0 = ...
-      if ((_671_0 == true) and (nil ~= _672_0)) then
-        local code = _672_0
-        local function _673_(...)
-          local _674_0, _675_0 = ...
-          if ((_674_0 == true) and (nil ~= _675_0)) then
-            local val = _675_0
+    e = setmetatable({}, {__index = _673_})
+    local function _674_(...)
+      local _675_0, _676_0 = ...
+      if ((_675_0 == true) and (nil ~= _676_0)) then
+        local code = _676_0
+        local function _677_(...)
+          local _678_0, _679_0 = ...
+          if ((_678_0 == true) and (nil ~= _679_0)) then
+            local val = _679_0
             return val
           else
-            local _ = _674_0
+            local _ = _678_0
             return nil
           end
         end
-        return _673_(pcall(specials["load-code"](code, e)))
+        return _677_(pcall(specials["load-code"](code, e)))
       else
-        local _ = _671_0
+        local _ = _675_0
         return nil
       end
     end
-    return _670_(pcall(compiler["compile-string"], tostring(identifier), {scope = scope}))
+    return _674_(pcall(compiler["compile-string"], tostring(identifier), {scope = scope}))
   end
   commands.find = function(env, read, on_values, on_error, scope)
-    local function _678_(_241)
-      local _679_0 = nil
+    local function _682_(_241)
+      local _683_0 = nil
       do
-        local _680_0 = utils["sym?"](_241)
-        if (nil ~= _680_0) then
-          local _681_0 = resolve(_680_0, env, scope)
-          if (nil ~= _681_0) then
-            _679_0 = debug.getinfo(_681_0)
+        local _684_0 = utils["sym?"](_241)
+        if (nil ~= _684_0) then
+          local _685_0 = resolve(_684_0, env, scope)
+          if (nil ~= _685_0) then
+            _683_0 = debug.getinfo(_685_0)
           else
-            _679_0 = _681_0
+            _683_0 = _685_0
           end
         else
-          _679_0 = _680_0
+          _683_0 = _684_0
         end
       end
-      if ((_G.type(_679_0) == "table") and (nil ~= _679_0.linedefined) and (nil ~= _679_0.short_src) and (nil ~= _679_0.source) and (_679_0.what == "Lua")) then
-        local line = _679_0.linedefined
-        local src = _679_0.short_src
-        local source = _679_0.source
+      if ((_G.type(_683_0) == "table") and (nil ~= _683_0.linedefined) and (nil ~= _683_0.short_src) and (nil ~= _683_0.source) and (_683_0.what == "Lua")) then
+        local line = _683_0.linedefined
+        local src = _683_0.short_src
+        local source = _683_0.source
         local fnlsrc = nil
         do
-          local _684_0 = compiler.sourcemap
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[source]
+          local _688_0 = compiler.sourcemap
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[source]
           end
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[line]
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[line]
           end
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[2]
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[2]
           end
-          fnlsrc = _684_0
+          fnlsrc = _688_0
         end
         return on_values({string.format("%s:%s", src, (fnlsrc or line))})
-      elseif (_679_0 == nil) then
+      elseif (_683_0 == nil) then
         return on_error("Repl", "Unknown value")
       else
-        local _ = _679_0
+        local _ = _683_0
         return on_error("Repl", "No source info")
       end
     end
-    return run_command(read, on_error, _678_)
+    return run_command(read, on_error, _682_)
   end
   do end (compiler.metadata):set(commands.find, "fnl/docstring", "Print the filename and line number for a given function")
   commands.doc = function(env, read, on_values, on_error, scope)
-    local function _689_(_241)
+    local function _693_(_241)
       local name = tostring(_241)
       local path = (utils["multi-sym?"](name) or {name})
       local ok_3f, target = nil, nil
-      local function _690_()
+      local function _694_()
         return (utils["get-in"](scope.specials, path) or utils["get-in"](scope.macros, path) or resolve(name, env, scope))
       end
-      ok_3f, target = pcall(_690_)
+      ok_3f, target = pcall(_694_)
       if ok_3f then
         return on_values({specials.doc(target, name)})
       else
         return on_error("Repl", ("Could not find " .. name .. " for docs."))
       end
     end
-    return run_command(read, on_error, _689_)
+    return run_command(read, on_error, _693_)
   end
   do end (compiler.metadata):set(commands.doc, "fnl/docstring", "Print the docstring and arglist for a function, macro, or special form.")
   commands.compile = function(env, read, on_values, on_error, scope)
-    local function _692_(_241)
+    local function _696_(_241)
       local allowedGlobals = specials["current-global-names"](env)
       local ok_3f, result = pcall(compiler.compile, _241, {allowedGlobals = allowedGlobals, env = env, scope = scope})
       if ok_3f then
@@ -696,15 +708,15 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         return on_error("Repl", ("Error compiling expression: " .. result))
       end
     end
-    return run_command(read, on_error, _692_)
+    return run_command(read, on_error, _696_)
   end
   do end (compiler.metadata):set(commands.compile, "fnl/docstring", "compiles the expression into lua and prints the result.")
   local function load_plugin_commands(plugins)
     for i = #(plugins or {}), 1, -1 do
       for name, f in pairs(plugins[i]) do
-        local _694_0 = name:match("^repl%-command%-(.*)")
-        if (nil ~= _694_0) then
-          local cmd_name = _694_0
+        local _698_0 = name:match("^repl%-command%-(.*)")
+        if (nil ~= _698_0) then
+          local cmd_name = _698_0
           commands[cmd_name] = f
         end
       end
@@ -714,19 +726,19 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   local function run_command_loop(input, read, loop, env, on_values, on_error, scope, chars)
     local command_name = input:match(",([^%s/]+)")
     do
-      local _696_0 = commands[command_name]
-      if (nil ~= _696_0) then
-        local command = _696_0
+      local _700_0 = commands[command_name]
+      if (nil ~= _700_0) then
+        local command = _700_0
         command(env, read, on_values, on_error, scope, chars)
       else
-        local _ = _696_0
-        if ("exit" ~= command_name) then
+        local _ = _700_0
+        if ((command_name ~= "exit") and (command_name ~= "return")) then
           on_values({"Unknown command", command_name})
         end
       end
     end
     if ("exit" ~= command_name) then
-      return loop()
+      return loop((command_name == "return"))
     end
   end
   local function try_readline_21(opts, ok, readline)
@@ -769,9 +781,9 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   end
   local function repl(_3foptions)
     local old_root_options = utils.root.options
-    local _705_ = utils.copy(_3foptions)
-    local opts = _705_
-    local _3ffennelrc = _705_["fennelrc"]
+    local _709_ = utils.copy(_3foptions)
+    local opts = _709_
+    local _3ffennelrc = _709_["fennelrc"]
     local _ = nil
     opts.fennelrc = nil
     _ = nil
@@ -786,35 +798,42 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     local callbacks = {env = env, onError = (opts.onError or default_on_error), onValues = (opts.onValues or default_on_values), pp = (opts.pp or view), readChunk = (opts.readChunk or default_read_chunk)}
     local save_locals_3f = (opts.saveLocals ~= false)
     local byte_stream, clear_stream = nil, nil
-    local function _707_(_241)
+    local function _711_(_241)
       return callbacks.readChunk(_241)
     end
-    byte_stream, clear_stream = parser.granulate(_707_)
+    byte_stream, clear_stream = parser.granulate(_711_)
     local chars = {}
     local read, reset = nil, nil
-    local function _708_(parser_state)
+    local function _712_(parser_state)
       local b = byte_stream(parser_state)
       if b then
         table.insert(chars, string.char(b))
       end
       return b
     end
-    read, reset = parser.parser(_708_)
+    read, reset = parser.parser(_712_)
+    depth = (depth + 1)
+    if opts.message then
+      callbacks.onValues({opts.message})
+    end
     env.___repl___ = callbacks
     opts.env, opts.scope = env, compiler["make-scope"]()
     opts.useMetadata = (opts.useMetadata ~= false)
     if (opts.allowedGlobals == nil) then
       opts.allowedGlobals = specials["current-global-names"](env)
     end
+    if opts.init then
+      opts.init(opts, depth)
+    end
     if opts.registerCompleter then
-      local function _712_()
-        local _711_0 = opts.scope
-        local function _713_(...)
-          return completer(env, _711_0, ...)
+      local function _718_()
+        local _717_0 = opts.scope
+        local function _719_(...)
+          return completer(env, _717_0, ...)
         end
-        return _713_
+        return _719_
       end
-      opts.registerCompleter(_712_())
+      opts.registerCompleter(_718_())
     end
     load_plugin_commands(opts.plugins)
     if save_locals_3f then
@@ -835,12 +854,21 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       end
       return callbacks.onValues(out)
     end
-    local function loop()
+    local function save_value(...)
+      env.___replLocals___["*3"] = env.___replLocals___["*2"]
+      env.___replLocals___["*2"] = env.___replLocals___["*1"]
+      env.___replLocals___["*1"] = ...
+      return ...
+    end
+    opts.scope.manglings["*1"], opts.scope.unmanglings._1 = "_1", "*1"
+    opts.scope.manglings["*2"], opts.scope.unmanglings._2 = "_2", "*2"
+    opts.scope.manglings["*3"], opts.scope.unmanglings._3 = "_3", "*3"
+    local function loop(exit_next_3f)
       for k in pairs(chars) do
         chars[k] = nil
       end
       reset()
-      local ok, parser_not_eof_3f, x = pcall(read)
+      local ok, parser_not_eof_3f, form = pcall(read)
       local src_string = table.concat(chars)
       local readline_not_eof_3f = (not readline or (src_string ~= "(null)"))
       local not_eof_3f = (readline_not_eof_3f and parser_not_eof_3f)
@@ -852,52 +880,66 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         return run_command_loop(src_string, read, loop, env, callbacks.onValues, callbacks.onError, opts.scope, chars)
       else
         if not_eof_3f then
-          do
-            local _717_0, _718_0 = nil, nil
-            local function _719_()
-              opts["source"] = src_string
-              return opts
-            end
-            _717_0, _718_0 = pcall(compiler.compile, x, _719_())
-            if ((_717_0 == false) and (nil ~= _718_0)) then
-              local msg = _718_0
+          local function _723_(...)
+            local _724_0, _725_0 = ...
+            if ((_724_0 == true) and (nil ~= _725_0)) then
+              local src = _725_0
+              local function _726_(...)
+                local _727_0, _728_0 = ...
+                if ((_727_0 == true) and (nil ~= _728_0)) then
+                  local chunk = _728_0
+                  local function _729_()
+                    return print_values(save_value(chunk()))
+                  end
+                  local function _730_(...)
+                    return callbacks.onError("Runtime", ...)
+                  end
+                  return xpcall(_729_, _730_)
+                elseif ((_727_0 == false) and (nil ~= _728_0)) then
+                  local msg = _728_0
+                  clear_stream()
+                  return callbacks.onError("Compile", msg)
+                end
+              end
+              local function _733_(...)
+                local src0 = nil
+                if save_locals_3f then
+                  src0 = splice_save_locals(env, src, opts.scope)
+                else
+                  src0 = src
+                end
+                return pcall(specials["load-code"], src0, env)
+              end
+              return _726_(_733_(...))
+            elseif ((_724_0 == false) and (nil ~= _725_0)) then
+              local msg = _725_0
               clear_stream()
-              callbacks.onError("Compile", msg)
-            elseif ((_717_0 == true) and (nil ~= _718_0)) then
-              local src = _718_0
-              local src0 = nil
-              if save_locals_3f then
-                src0 = splice_save_locals(env, src, opts.scope)
-              else
-                src0 = src
-              end
-              local _721_0, _722_0 = pcall(specials["load-code"], src0, env)
-              if ((_721_0 == false) and (nil ~= _722_0)) then
-                local msg = _722_0
-                clear_stream()
-                callbacks.onError("Lua Compile", msg, src0)
-              elseif (true and (nil ~= _722_0)) then
-                local _1 = _721_0
-                local chunk = _722_0
-                local function _723_()
-                  return print_values(chunk())
-                end
-                local function _724_(...)
-                  return callbacks.onError("Runtime", ...)
-                end
-                xpcall(_723_, _724_)
-              end
+              return callbacks.onError("Compile", msg)
             end
           end
+          local function _735_()
+            opts["source"] = src_string
+            return opts
+          end
+          _723_(pcall(compiler.compile, form, _735_()))
           utils.root.options = old_root_options
-          return loop()
+          if exit_next_3f then
+            return env.___replLocals___["*1"]
+          else
+            return loop()
+          end
         end
       end
     end
-    loop()
+    local value = loop()
+    depth = (depth - 1)
     if readline then
-      return readline.save_history()
+      readline.save_history()
     end
+    if opts.exit then
+      opts.exit(opts, depth)
+    end
+    return value
   end
   return repl
 end
@@ -909,14 +951,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local unpack = (table.unpack or _G.unpack)
   local SPECIALS = compiler.scopes.global.specials
   local function wrap_env(env)
-    local function _416_(_, key)
+    local function _418_(_, key)
       if utils["string?"](key) then
         return env[compiler["global-unmangling"](key)]
       else
         return env[key]
       end
     end
-    local function _418_(_, key, value)
+    local function _420_(_, key, value)
       if utils["string?"](key) then
         env[compiler["global-unmangling"](key)] = value
         return nil
@@ -925,26 +967,26 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         return nil
       end
     end
-    local function _420_()
+    local function _422_()
       local function putenv(k, v)
-        local _421_
+        local _423_
         if utils["string?"](k) then
-          _421_ = compiler["global-unmangling"](k)
+          _423_ = compiler["global-unmangling"](k)
         else
-          _421_ = k
+          _423_ = k
         end
-        return _421_, v
+        return _423_, v
       end
       return next, utils.kvmap(env, putenv), nil
     end
-    return setmetatable({}, {__index = _416_, __newindex = _418_, __pairs = _420_})
+    return setmetatable({}, {__index = _418_, __newindex = _420_, __pairs = _422_})
   end
   local function current_global_names(_3fenv)
     local mt = nil
     do
-      local _423_0 = getmetatable(_3fenv)
-      if ((_G.type(_423_0) == "table") and (nil ~= _423_0.__pairs)) then
-        local mtpairs = _423_0.__pairs
+      local _425_0 = getmetatable(_3fenv)
+      if ((_G.type(_425_0) == "table") and (nil ~= _425_0.__pairs)) then
+        local mtpairs = _425_0.__pairs
         local tbl_14_ = {}
         for k, v in mtpairs(_3fenv) do
           local k_15_, v_16_ = k, v
@@ -953,7 +995,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           end
         end
         mt = tbl_14_
-      elseif (_423_0 == nil) then
+      elseif (_425_0 == nil) then
         mt = (_3fenv or _G)
       else
       mt = nil
@@ -963,15 +1005,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function load_code(code, _3fenv, _3ffilename)
     local env = (_3fenv or rawget(_G, "_ENV") or _G)
-    local _426_0, _427_0 = rawget(_G, "setfenv"), rawget(_G, "loadstring")
-    if ((nil ~= _426_0) and (nil ~= _427_0)) then
-      local setfenv = _426_0
-      local loadstring = _427_0
+    local _428_0, _429_0 = rawget(_G, "setfenv"), rawget(_G, "loadstring")
+    if ((nil ~= _428_0) and (nil ~= _429_0)) then
+      local setfenv = _428_0
+      local loadstring = _429_0
       local f = assert(loadstring(code, _3ffilename))
       setfenv(f, env)
       return f
     else
-      local _ = _426_0
+      local _ = _428_0
       return assert(load(code, _3ffilename, "t", env))
     end
   end
@@ -983,13 +1025,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       local mt = getmetatable(tgt)
       if ((type(tgt) == "function") or ((type(mt) == "table") and (type(mt.__call) == "function"))) then
         local arglist = table.concat(((compiler.metadata):get(tgt, "fnl/arglist") or {"#<unknown-arguments>"}), " ")
-        local _429_
+        local _431_
         if (0 < #arglist) then
-          _429_ = " "
+          _431_ = " "
         else
-          _429_ = ""
+          _431_ = ""
         end
-        return string.format("(%s%s%s)\n  %s", name, _429_, arglist, docstring)
+        return string.format("(%s%s%s)\n  %s", name, _431_, arglist, docstring)
       else
         return string.format("%s\n  %s", name, docstring)
       end
@@ -1016,16 +1058,12 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local retexprs = {returned = true}
     utils.hook("customhook-early-do", ast, sub_scope)
     local function compile_body(outer_target, outer_tail, outer_retexprs)
-      if (len < start) then
-        compiler.compile1(nil, sub_scope, chunk, {tail = outer_tail, target = outer_target})
-      else
-        for i = start, len do
-          local subopts = {nval = (((i ~= len) and 0) or opts.nval), tail = (((i == len) and outer_tail) or nil), target = (((i == len) and outer_target) or nil)}
-          local _ = utils["propagate-options"](opts, subopts)
-          local subexprs = compiler.compile1(ast[i], sub_scope, chunk, subopts)
-          if (i ~= len) then
-            compiler["keep-side-effects"](subexprs, parent, nil, ast[i])
-          end
+      for i = start, len do
+        local subopts = {nval = (((i ~= len) and 0) or opts.nval), tail = (((i == len) and outer_tail) or nil), target = (((i == len) and outer_target) or nil)}
+        local _ = utils["propagate-options"](opts, subopts)
+        local subexprs = compiler.compile1(ast[i], sub_scope, chunk, subopts)
+        if (i ~= len) then
+          compiler["keep-side-effects"](subexprs, parent, nil, ast[i])
         end
       end
       compiler.emit(parent, chunk, ast)
@@ -1103,9 +1141,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local opts = {nval = 1, tail = false}
     local scope = compiler["make-scope"]()
     local chunk = {}
-    local _440_ = compiler.compile1(v, scope, chunk, opts)
-    local _441_ = _440_[1]
-    local v0 = _441_[1]
+    local _441_ = compiler.compile1(v, scope, chunk, opts)
+    local _442_ = _441_[1]
+    local v0 = _442_[1]
     return v0
   end
   local function insert_meta(meta, k, v)
@@ -1113,23 +1151,23 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((type(k) == "string"), ("expected string keys in metadata table, got: %s"):format(view(k, view_opts)))
     compiler.assert(literal_3f(v), ("expected literal value in metadata table, got: %s %s"):format(view(k, view_opts), view(v, view_opts)))
     table.insert(meta, view(k))
-    local function _442_()
+    local function _443_()
       if ("string" == type(v)) then
         return view(v, view_opts)
       else
         return compile_value(v)
       end
     end
-    table.insert(meta, _442_())
+    table.insert(meta, _443_())
     return meta
   end
   local function insert_arglist(meta, arg_list)
     local view_opts = {["escape-newlines?"] = true, ["line-length"] = math.huge, ["one-line?"] = true}
     table.insert(meta, "\"fnl/arglist\"")
-    local function _443_(_241)
+    local function _444_(_241)
       return view(view(_241, view_opts))
     end
-    table.insert(meta, ("{" .. table.concat(utils.map(arg_list, _443_), ", ") .. "}"))
+    table.insert(meta, ("{" .. table.concat(utils.map(arg_list, _444_), ", ") .. "}"))
     return meta
   end
   local function set_fn_metadata(f_metadata, parent, fn_name)
@@ -1148,13 +1186,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function get_fn_name(ast, scope, fn_name, multi)
     if (fn_name and (fn_name[1] ~= "nil")) then
-      local _446_
+      local _447_
       if not multi then
-        _446_ = compiler["declare-local"](fn_name, {}, scope, ast)
+        _447_ = compiler["declare-local"](fn_name, {}, scope, ast)
       else
-        _446_ = compiler["symbol-to-expression"](fn_name, scope)[1]
+        _447_ = compiler["symbol-to-expression"](fn_name, scope)[1]
       end
-      return _446_, not multi, 3
+      return _447_, not multi, 3
     else
       return nil, true, 2
     end
@@ -1164,13 +1202,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     for i = (index + 1), #ast do
       compiler.compile1(ast[i], f_scope, f_chunk, {nval = (((i ~= #ast) and 0) or nil), tail = (i == #ast)})
     end
-    local _449_
+    local _450_
     if local_3f then
-      _449_ = "local function %s(%s)"
+      _450_ = "local function %s(%s)"
     else
-      _449_ = "%s = function(%s)"
+      _450_ = "%s = function(%s)"
     end
-    compiler.emit(parent, string.format(_449_, fn_name, table.concat(arg_name_list, ", ")), ast)
+    compiler.emit(parent, string.format(_450_, fn_name, table.concat(arg_name_list, ", ")), ast)
     compiler.emit(parent, f_chunk, ast)
     compiler.emit(parent, "end", ast)
     set_fn_metadata(f_metadata, parent, fn_name)
@@ -1192,7 +1230,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function get_function_metadata(ast, arg_list, index)
-    local function _452_(_241, _242)
+    local function _453_(_241, _242)
       local tbl_14_ = _241
       for k, v in pairs(_242) do
         local k_15_, v_16_ = k, v
@@ -1202,18 +1240,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       end
       return tbl_14_
     end
-    local function _454_(_241, _242)
+    local function _455_(_241, _242)
       _241["fnl/docstring"] = _242
       return _241
     end
-    return maybe_metadata(ast, utils["kv-table?"], _452_, maybe_metadata(ast, utils["string?"], _454_, {["fnl/arglist"] = arg_list}, index))
+    return maybe_metadata(ast, utils["kv-table?"], _453_, maybe_metadata(ast, utils["string?"], _455_, {["fnl/arglist"] = arg_list}, index))
   end
   SPECIALS.fn = function(ast, scope, parent)
     local f_scope = nil
     do
-      local _455_0 = compiler["make-scope"](scope)
-      _455_0["vararg"] = false
-      f_scope = _455_0
+      local _456_0 = compiler["make-scope"](scope)
+      _456_0["vararg"] = false
+      f_scope = _456_0
     end
     local f_chunk = {}
     local fn_sym = utils["sym?"](ast[2])
@@ -1273,36 +1311,36 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special("fn", {"name?", "args", "docstring?", "..."}, "Function syntax. May optionally include a name and docstring or a metadata table.\nIf a name is provided, the function will be bound in the current scope.\nWhen called with the wrong number of args, excess args will be discarded\nand lacking args will be nil, use lambda for arity-checked functions.", true)
   SPECIALS.lua = function(ast, _, parent)
     compiler.assert(((#ast == 2) or (#ast == 3)), "expected 1 or 2 arguments", ast)
-    local _460_
+    local _461_
     do
-      local _459_0 = utils["sym?"](ast[2])
-      if (nil ~= _459_0) then
-        _460_ = tostring(_459_0)
+      local _460_0 = utils["sym?"](ast[2])
+      if (nil ~= _460_0) then
+        _461_ = tostring(_460_0)
       else
-        _460_ = _459_0
+        _461_ = _460_0
       end
     end
-    if ("nil" ~= _460_) then
+    if ("nil" ~= _461_) then
       table.insert(parent, {ast = ast, leaf = tostring(ast[2])})
     end
-    local _464_
+    local _465_
     do
-      local _463_0 = utils["sym?"](ast[3])
-      if (nil ~= _463_0) then
-        _464_ = tostring(_463_0)
+      local _464_0 = utils["sym?"](ast[3])
+      if (nil ~= _464_0) then
+        _465_ = tostring(_464_0)
       else
-        _464_ = _463_0
+        _465_ = _464_0
       end
     end
-    if ("nil" ~= _464_) then
+    if ("nil" ~= _465_) then
       return tostring(ast[3])
     end
   end
   local function dot(ast, scope, parent)
     compiler.assert((1 < #ast), "expected table argument", ast)
     local len = #ast
-    local _467_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local lhs = _467_[1]
+    local _468_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local lhs = _468_[1]
     if (len == 2) then
       return tostring(lhs)
     else
@@ -1312,8 +1350,8 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         if (utils["string?"](index) and utils["valid-lua-identifier?"](index)) then
           table.insert(indices, ("." .. index))
         else
-          local _468_ = compiler.compile1(index, scope, parent, {nval = 1})
-          local index0 = _468_[1]
+          local _469_ = compiler.compile1(index, scope, parent, {nval = 1})
+          local index0 = _469_[1]
           table.insert(indices, ("[" .. tostring(index0) .. "]"))
         end
       end
@@ -1358,7 +1396,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   doc_special("var", {"name", "val"}, "Introduce new mutable local.")
   local function kv_3f(t)
-    local _472_
+    local _473_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
@@ -1374,9 +1412,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           tbl_17_[i_18_] = val_19_
         end
       end
-      _472_ = tbl_17_
+      _473_ = tbl_17_
     end
-    return _472_[1]
+    return _473_[1]
   end
   SPECIALS.let = function(ast, scope, parent, opts)
     local bindings = ast[2]
@@ -1403,22 +1441,22 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function disambiguate_3f(rootstr, parent)
-    local function _477_()
-      local _476_0 = get_prev_line(parent)
-      if (nil ~= _476_0) then
-        local prev_line = _476_0
+    local function _478_()
+      local _477_0 = get_prev_line(parent)
+      if (nil ~= _477_0) then
+        local prev_line = _477_0
         return prev_line:match("%)$")
       end
     end
-    return (rootstr:match("^{") or rootstr:match("^%(") or _477_())
+    return (rootstr:match("^{") or rootstr:match("^%(") or _478_())
   end
   SPECIALS.tset = function(ast, scope, parent)
     compiler.assert((3 < #ast), "expected table, key, and value arguments", ast)
     local root = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
     local keys = {}
     for i = 3, (#ast - 1) do
-      local _479_ = compiler.compile1(ast[i], scope, parent, {nval = 1})
-      local key = _479_[1]
+      local _480_ = compiler.compile1(ast[i], scope, parent, {nval = 1})
+      local key = _480_[1]
       table.insert(keys, tostring(key))
     end
     local value = compiler.compile1(ast[#ast], scope, parent, {nval = 1})[1]
@@ -1432,7 +1470,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     return compiler.emit(parent, fmtstr:format(rootstr, table.concat(keys, "]["), tostring(value)), ast)
   end
   doc_special("tset", {"tbl", "key1", "...", "keyN", "val"}, "Set the value of a table field. Can take additional keys to set\nnested values, but all parents must contain an existing table.")
-  local function calculate_target(scope, opts)
+  local function calculate_if_target(scope, opts)
     if not (opts.tail or opts.target or opts.nval) then
       return "iife", true, nil
     elseif (opts.nval and (opts.nval ~= 0) and not opts.target) then
@@ -1461,7 +1499,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     else
       local do_scope = compiler["make-scope"](scope)
       local branches = {}
-      local wrapper, inner_tail, inner_target, target_exprs = calculate_target(scope, opts)
+      local wrapper, inner_tail, inner_target, target_exprs = calculate_if_target(scope, opts)
       local body_opts = {nval = opts.nval, tail = inner_tail, target = inner_target}
       local function compile_body(i)
         local chunk = {}
@@ -1545,15 +1583,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function compile_until(condition, scope, chunk)
     if condition then
-      local _490_ = compiler.compile1(condition, scope, chunk, {nval = 1})
-      local condition_lua = _490_[1]
+      local _491_ = compiler.compile1(condition, scope, chunk, {nval = 1})
+      local condition_lua = _491_[1]
       return compiler.emit(chunk, ("if %s then break end"):format(tostring(condition_lua)), utils.expr(condition, "expression"))
     end
   end
   SPECIALS.each = function(ast, scope, parent)
     compiler.assert((3 <= #ast), "expected body expression", ast[1])
     compiler.assert(utils["table?"](ast[2]), "expected binding table", ast)
-    compiler.assert((2 <= #ast[2]), "expected binding and iterator", ast)
     local binding = setmetatable(utils.copy(ast[2]), getmetatable(ast[2]))
     local until_condition = remove_until_condition(binding)
     local iter = table.remove(binding, #binding)
@@ -1575,6 +1612,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local vals = compiler.compile1(iter, scope, parent)
     local val_names = utils.map(vals, tostring)
     local chunk = {}
+    compiler.assert(bind_vars[1], "expected binding and iterator", ast)
     compiler.emit(parent, ("for %s in %s do"):format(table.concat(bind_vars, ", "), table.concat(val_names, ", ")), ast)
     for raw, args in utils.stablepairs(destructures) do
       compiler.destructure(args, raw, ast, sub_scope, chunk, {declaration = true, nomulti = true, symtype = "each"})
@@ -1632,10 +1670,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   SPECIALS["for"] = for_2a
   doc_special("for", {"[index start stop step?]", "..."}, "Numeric loop construct.\nEvaluates body once for each value between start and stop (inclusive).", true)
   local function native_method_call(ast, _scope, _parent, target, args)
-    local _494_ = ast
-    local _ = _494_[1]
-    local _0 = _494_[2]
-    local method_string = _494_[3]
+    local _495_ = ast
+    local _ = _495_[1]
+    local _0 = _495_[2]
+    local method_string = _495_[3]
     local call_string = nil
     if ((target.type == "literal") or (target.type == "varg") or (target.type == "expression")) then
       call_string = "(%s):%s(%s)"
@@ -1657,18 +1695,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function method_call(ast, scope, parent)
     compiler.assert((2 < #ast), "expected at least 2 arguments", ast)
-    local _496_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local target = _496_[1]
+    local _497_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local target = _497_[1]
     local args = {}
     for i = 4, #ast do
       local subexprs = nil
-      local _497_
+      local _498_
       if (i ~= #ast) then
-        _497_ = 1
+        _498_ = 1
       else
-      _497_ = nil
+      _498_ = nil
       end
-      subexprs = compiler.compile1(ast[i], scope, parent, {nval = _497_})
+      subexprs = compiler.compile1(ast[i], scope, parent, {nval = _498_})
       utils.map(subexprs, tostring, args)
     end
     if (utils["string?"](ast[3]) and utils["valid-lua-identifier?"](ast[3])) then
@@ -1683,14 +1721,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special(":", {"tbl", "method-name", "..."}, "Call the named method on tbl with the provided args.\nMethod name doesn't have to be known at compile-time; if it is, use\n(tbl:method-name ...) instead.")
   SPECIALS.comment = function(ast, _, parent)
     local c = nil
-    local _500_
+    local _501_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
       for i, elt in ipairs(ast) do
         local val_19_ = nil
         if (i ~= 1) then
-          val_19_ = view(ast[i], {["one-line?"] = true})
+          val_19_ = view(elt, {["one-line?"] = true})
         else
         val_19_ = nil
         end
@@ -1699,9 +1737,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           tbl_17_[i_18_] = val_19_
         end
       end
-      _500_ = tbl_17_
+      _501_ = tbl_17_
     end
-    c = table.concat(_500_, " "):gsub("%]%]", "]\\]")
+    c = table.concat(_501_, " "):gsub("%]%]", "]\\]")
     return compiler.emit(parent, ("--[[ " .. c .. " ]]"), ast)
   end
   doc_special("comment", {"..."}, "Comment which will be emitted in Lua output.", true)
@@ -1722,10 +1760,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "expected one argument", ast)
     local f_scope = nil
     do
-      local _505_0 = compiler["make-scope"](scope)
-      _505_0["vararg"] = false
-      _505_0["hashfn"] = true
-      f_scope = _505_0
+      local _506_0 = compiler["make-scope"](scope)
+      _506_0["vararg"] = false
+      _506_0["hashfn"] = true
+      f_scope = _506_0
     end
     local f_chunk = {}
     local name = compiler.gensym(scope)
@@ -1766,17 +1804,17 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     return utils.expr(name, "sym")
   end
   doc_special("hashfn", {"..."}, "Function literal shorthand; args are either $... OR $1, $2, etc.")
-  local function maybe_short_circuit_protect(ast, i, name, _510_0)
-    local _511_ = _510_0
-    local mac = _511_["macros"]
+  local function maybe_short_circuit_protect(ast, i, name, _511_0)
+    local _512_ = _511_0
+    local mac = _512_["macros"]
     local call = (utils["list?"](ast) and tostring(ast[1]))
     if ((("or" == name) or ("and" == name)) and (1 < i) and (mac[call] or ("set" == call) or ("tset" == call) or ("global" == call))) then
-      return utils.list(utils.sym("do"), ast)
+      return utils.list(utils.list(utils.sym("fn"), utils.sequence(utils.varg()), ast))
     else
       return ast
     end
   end
-  local function arithmetic_special(name, zero_arity, unary_prefix, ast, scope, parent)
+  local function operator_special(name, zero_arity, unary_prefix, ast, scope, parent)
     local len = #ast
     local operands = {}
     local padded_op = (" " .. name .. " ")
@@ -1789,15 +1827,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         table.insert(operands, tostring(subexprs[1]))
       end
     end
-    local _514_0 = #operands
-    if (_514_0 == 0) then
-      local _515_
+    local _515_0 = #operands
+    if (_515_0 == 0) then
+      local _516_
       do
         compiler.assert(zero_arity, "Expected more than 0 arguments", ast)
-        _515_ = zero_arity
+        _516_ = zero_arity
       end
-      return utils.expr(_515_, "literal")
-    elseif (_514_0 == 1) then
+      return utils.expr(_516_, "literal")
+    elseif (_515_0 == 1) then
       if utils["varg?"](ast[2]) then
         return compiler.assert(false, "tried to use vararg with operator", ast)
       elseif unary_prefix then
@@ -1806,20 +1844,20 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         return operands[1]
       end
     else
-      local _ = _514_0
+      local _ = _515_0
       return ("(" .. table.concat(operands, padded_op) .. ")")
     end
   end
   local function define_arithmetic_special(name, zero_arity, unary_prefix, _3flua_name)
-    local _519_
+    local _520_
     do
-      local _518_0 = (_3flua_name or name)
-      local function _520_(...)
-        return arithmetic_special(_518_0, zero_arity, unary_prefix, ...)
+      local _519_0 = (_3flua_name or name)
+      local function _521_(...)
+        return operator_special(_519_0, zero_arity, unary_prefix, ...)
       end
-      _519_ = _520_
+      _520_ = _521_
     end
-    SPECIALS[name] = _519_
+    SPECIALS[name] = _520_
     return doc_special(name, {"a", "b", "..."}, "Arithmetic operator; works the same as Lua but accepts more arguments.")
   end
   define_arithmetic_special("+", "0")
@@ -1831,10 +1869,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   define_arithmetic_special("/", nil, "1")
   define_arithmetic_special("//", nil, "1")
   SPECIALS["or"] = function(ast, scope, parent)
-    return arithmetic_special("or", "false", nil, ast, scope, parent)
+    return operator_special("or", "false", nil, ast, scope, parent)
   end
   SPECIALS["and"] = function(ast, scope, parent)
-    return arithmetic_special("and", "true", nil, ast, scope, parent)
+    return operator_special("and", "true", nil, ast, scope, parent)
   end
   doc_special("and", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
   doc_special("or", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
@@ -1848,13 +1886,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       local prefixed_lib_name = ("bit." .. lib_name)
       for i = 2, len do
         local subexprs = nil
-        local _521_
+        local _522_
         if (i ~= len) then
-          _521_ = 1
+          _522_ = 1
         else
-        _521_ = nil
+        _522_ = nil
         end
-        subexprs = compiler.compile1(ast[i], scope, parent, {nval = _521_})
+        subexprs = compiler.compile1(ast[i], scope, parent, {nval = _522_})
         utils.map(subexprs, tostring, operands)
       end
       if (#operands == 1) then
@@ -1873,10 +1911,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function define_bitop_special(name, zero_arity, unary_prefix, native)
-    local function _527_(...)
+    local function _528_(...)
       return bitop_special(native, name, zero_arity, unary_prefix, ...)
     end
-    SPECIALS[name] = _527_
+    SPECIALS[name] = _528_
     return nil
   end
   define_bitop_special("lshift", nil, "1", "<<")
@@ -1891,8 +1929,8 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special("bxor", {"x1", "x2", "..."}, "Bitwise XOR of any number of arguments.\nOnly works in Lua 5.3+ or LuaJIT with the --use-bit-lib flag.")
   SPECIALS.bnot = function(ast, scope, parent)
     compiler.assert((#ast == 2), "expected one argument", ast)
-    local _528_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local value = _528_[1]
+    local _529_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local value = _529_[1]
     if utils.root.options.useBitLib then
       return ("bit.bnot(" .. tostring(value) .. ")")
     else
@@ -1901,15 +1939,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   doc_special("bnot", {"x"}, "Bitwise negation; only works in Lua 5.3+ or LuaJIT with the --use-bit-lib flag.")
   doc_special("..", {"a", "b", "..."}, "String concatenation operator; works the same as Lua but accepts more arguments.")
-  local function native_comparator(op, _530_0, scope, parent)
-    local _531_ = _530_0
-    local _ = _531_[1]
-    local lhs_ast = _531_[2]
-    local rhs_ast = _531_[3]
-    local _532_ = compiler.compile1(lhs_ast, scope, parent, {nval = 1})
-    local lhs = _532_[1]
-    local _533_ = compiler.compile1(rhs_ast, scope, parent, {nval = 1})
-    local rhs = _533_[1]
+  local function native_comparator(op, _531_0, scope, parent)
+    local _532_ = _531_0
+    local _ = _532_[1]
+    local lhs_ast = _532_[2]
+    local rhs_ast = _532_[3]
+    local _533_ = compiler.compile1(lhs_ast, scope, parent, {nval = 1})
+    local lhs = _533_[1]
+    local _534_ = compiler.compile1(rhs_ast, scope, parent, {nval = 1})
+    local rhs = _534_[1]
     return string.format("(%s %s %s)", tostring(lhs), op, tostring(rhs))
   end
   local function idempotent_comparator(op, chain_op, ast, scope, parent)
@@ -2022,21 +2060,21 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local safe_require = nil
   local function safe_compiler_env()
-    local _540_
+    local _541_
     do
-      local _539_0 = rawget(_G, "utf8")
-      if (nil ~= _539_0) then
-        _540_ = utils.copy(_539_0)
+      local _540_0 = rawget(_G, "utf8")
+      if (nil ~= _540_0) then
+        _541_ = utils.copy(_540_0)
       else
-        _540_ = _539_0
+        _541_ = _540_0
       end
     end
-    return {_VERSION = _VERSION, assert = assert, bit = rawget(_G, "bit"), error = error, getmetatable = safe_getmetatable, ipairs = ipairs, math = utils.copy(math), next = next, pairs = utils.stablepairs, pcall = pcall, print = print, rawequal = rawequal, rawget = rawget, rawlen = rawget(_G, "rawlen"), rawset = rawset, require = safe_require, select = select, setmetatable = setmetatable, string = utils.copy(string), table = utils.copy(table), tonumber = tonumber, tostring = tostring, type = type, utf8 = _540_, xpcall = xpcall}
+    return {_VERSION = _VERSION, assert = assert, bit = rawget(_G, "bit"), error = error, getmetatable = safe_getmetatable, ipairs = ipairs, math = utils.copy(math), next = next, pairs = utils.stablepairs, pcall = pcall, print = print, rawequal = rawequal, rawget = rawget, rawlen = rawget(_G, "rawlen"), rawset = rawset, require = safe_require, select = select, setmetatable = setmetatable, string = utils.copy(string), table = utils.copy(table), tonumber = tonumber, tostring = tostring, type = type, utf8 = _541_, xpcall = xpcall}
   end
   local function combined_mt_pairs(env)
     local combined = {}
-    local _542_ = getmetatable(env)
-    local __index = _542_["__index"]
+    local _543_ = getmetatable(env)
+    local __index = _543_["__index"]
     if ("table" == type(__index)) then
       for k, v in pairs(__index) do
         combined[k] = v
@@ -2050,40 +2088,40 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local function make_compiler_env(ast, scope, parent, _3fopts)
     local provided = nil
     do
-      local _544_0 = (_3fopts or utils.root.options)
-      if ((_G.type(_544_0) == "table") and (_544_0["compiler-env"] == "strict")) then
+      local _545_0 = (_3fopts or utils.root.options)
+      if ((_G.type(_545_0) == "table") and (_545_0["compiler-env"] == "strict")) then
         provided = safe_compiler_env()
-      elseif ((_G.type(_544_0) == "table") and (nil ~= _544_0.compilerEnv)) then
-        local compilerEnv = _544_0.compilerEnv
+      elseif ((_G.type(_545_0) == "table") and (nil ~= _545_0.compilerEnv)) then
+        local compilerEnv = _545_0.compilerEnv
         provided = compilerEnv
-      elseif ((_G.type(_544_0) == "table") and (nil ~= _544_0["compiler-env"])) then
-        local compiler_env = _544_0["compiler-env"]
+      elseif ((_G.type(_545_0) == "table") and (nil ~= _545_0["compiler-env"])) then
+        local compiler_env = _545_0["compiler-env"]
         provided = compiler_env
       else
-        local _ = _544_0
-        provided = safe_compiler_env(false)
+        local _ = _545_0
+        provided = safe_compiler_env()
       end
     end
     local env = nil
-    local function _546_()
+    local function _547_()
       return compiler.scopes.macro
     end
-    local function _547_(symbol)
+    local function _548_(symbol)
       compiler.assert(compiler.scopes.macro, "must call from macro", ast)
       return compiler.scopes.macro.manglings[tostring(symbol)]
     end
-    local function _548_(base)
+    local function _549_(base)
       return utils.sym(compiler.gensym((compiler.scopes.macro or scope), base))
     end
-    local function _549_(form)
+    local function _550_(form)
       compiler.assert(compiler.scopes.macro, "must call from macro", ast)
       return compiler.macroexpand(form, compiler.scopes.macro)
     end
-    env = {["assert-compile"] = compiler.assert, ["ast-source"] = utils["ast-source"], ["comment?"] = utils["comment?"], ["get-scope"] = _546_, ["in-scope?"] = _547_, ["list?"] = utils["list?"], ["macro-loaded"] = macro_loaded, ["multi-sym?"] = utils["multi-sym?"], ["sequence?"] = utils["sequence?"], ["sym?"] = utils["sym?"], ["table?"] = utils["table?"], ["varg?"] = utils["varg?"], _AST = ast, _CHUNK = parent, _IS_COMPILER = true, _SCOPE = scope, _SPECIALS = compiler.scopes.global.specials, _VARARG = utils.varg(), comment = utils.comment, gensym = _548_, list = utils.list, macroexpand = _549_, metadata = compiler.metadata, sequence = utils.sequence, sym = utils.sym, unpack = unpack, version = utils.version, view = view}
+    env = {["assert-compile"] = compiler.assert, ["ast-source"] = utils["ast-source"], ["comment?"] = utils["comment?"], ["get-scope"] = _547_, ["in-scope?"] = _548_, ["list?"] = utils["list?"], ["macro-loaded"] = macro_loaded, ["multi-sym?"] = utils["multi-sym?"], ["sequence?"] = utils["sequence?"], ["sym?"] = utils["sym?"], ["table?"] = utils["table?"], ["varg?"] = utils["varg?"], _AST = ast, _CHUNK = parent, _IS_COMPILER = true, _SCOPE = scope, _SPECIALS = compiler.scopes.global.specials, _VARARG = utils.varg(), comment = utils.comment, gensym = _549_, list = utils.list, macroexpand = _550_, sequence = utils.sequence, sym = utils.sym, unpack = unpack, version = utils.version, view = view}
     env._G = env
     return setmetatable(env, {__index = provided, __newindex = provided, __pairs = combined_mt_pairs})
   end
-  local function _550_(...)
+  local function _551_(...)
     local tbl_17_ = {}
     local i_18_ = #tbl_17_
     for c in string.gmatch((package.config or ""), "([^\n]+)") do
@@ -2095,10 +2133,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
     return tbl_17_
   end
-  local _552_ = _550_(...)
-  local dirsep = _552_[1]
-  local pathsep = _552_[2]
-  local pathmark = _552_[3]
+  local _553_ = _551_(...)
+  local dirsep = _553_[1]
+  local pathsep = _553_[2]
+  local pathmark = _553_[3]
   local pkg_config = {dirsep = (dirsep or "/"), pathmark = (pathmark or "?"), pathsep = (pathsep or ";")}
   local function escapepat(str)
     return string.gsub(str, "[^%w]", "%%%1")
@@ -2111,36 +2149,36 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local function try_path(path)
       local filename = path:gsub(escapepat(pkg_config.pathmark), no_dot_module)
       local filename2 = path:gsub(escapepat(pkg_config.pathmark), modulename)
-      local _553_0 = (io.open(filename) or io.open(filename2))
-      if (nil ~= _553_0) then
-        local file = _553_0
+      local _554_0 = (io.open(filename) or io.open(filename2))
+      if (nil ~= _554_0) then
+        local file = _554_0
         file:close()
         return filename
       else
-        local _ = _553_0
+        local _ = _554_0
         return nil, ("no file '" .. filename .. "'")
       end
     end
     local function find_in_path(start, _3ftried_paths)
-      local _555_0 = fullpath:match(pattern, start)
-      if (nil ~= _555_0) then
-        local path = _555_0
-        local _556_0, _557_0 = try_path(path)
-        if (nil ~= _556_0) then
-          local filename = _556_0
+      local _556_0 = fullpath:match(pattern, start)
+      if (nil ~= _556_0) then
+        local path = _556_0
+        local _557_0, _558_0 = try_path(path)
+        if (nil ~= _557_0) then
+          local filename = _557_0
           return filename
-        elseif ((_556_0 == nil) and (nil ~= _557_0)) then
-          local error = _557_0
-          local function _559_()
-            local _558_0 = (_3ftried_paths or {})
-            table.insert(_558_0, error)
-            return _558_0
+        elseif ((_557_0 == nil) and (nil ~= _558_0)) then
+          local error = _558_0
+          local function _560_()
+            local _559_0 = (_3ftried_paths or {})
+            table.insert(_559_0, error)
+            return _559_0
           end
-          return find_in_path((start + #path + 1), _559_())
+          return find_in_path((start + #path + 1), _560_())
         end
       else
-        local _ = _555_0
-        local function _561_()
+        local _ = _556_0
+        local function _562_()
           local tried_paths = table.concat((_3ftried_paths or {}), "\n\9")
           if (_VERSION < "Lua 5.4") then
             return ("\n\9" .. tried_paths)
@@ -2148,31 +2186,31 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
             return tried_paths
           end
         end
-        return nil, _561_()
+        return nil, _562_()
       end
     end
     return find_in_path(1)
   end
   local function make_searcher(_3foptions)
-    local function _564_(module_name)
+    local function _565_(module_name)
       local opts = utils.copy(utils.root.options)
       for k, v in pairs((_3foptions or {})) do
         opts[k] = v
       end
       opts["module-name"] = module_name
-      local _565_0, _566_0 = search_module(module_name)
-      if (nil ~= _565_0) then
-        local filename = _565_0
-        local function _567_(...)
+      local _566_0, _567_0 = search_module(module_name)
+      if (nil ~= _566_0) then
+        local filename = _566_0
+        local function _568_(...)
           return utils["fennel-module"].dofile(filename, opts, ...)
         end
-        return _567_, filename
-      elseif ((_565_0 == nil) and (nil ~= _566_0)) then
-        local error = _566_0
+        return _568_, filename
+      elseif ((_566_0 == nil) and (nil ~= _567_0)) then
+        local error = _567_0
         return error
       end
     end
-    return _564_
+    return _565_
   end
   local function dofile_with_searcher(fennel_macro_searcher, filename, opts, ...)
     local searchers = (package.loaders or package.searchers or {})
@@ -2184,35 +2222,35 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local function fennel_macro_searcher(module_name)
     local opts = nil
     do
-      local _569_0 = utils.copy(utils.root.options)
-      _569_0["module-name"] = module_name
-      _569_0["env"] = "_COMPILER"
-      _569_0["requireAsInclude"] = false
-      _569_0["allowedGlobals"] = nil
-      opts = _569_0
+      local _570_0 = utils.copy(utils.root.options)
+      _570_0["module-name"] = module_name
+      _570_0["env"] = "_COMPILER"
+      _570_0["requireAsInclude"] = false
+      _570_0["allowedGlobals"] = nil
+      opts = _570_0
     end
-    local _570_0 = search_module(module_name, utils["fennel-module"]["macro-path"])
-    if (nil ~= _570_0) then
-      local filename = _570_0
-      local _571_
+    local _571_0 = search_module(module_name, utils["fennel-module"]["macro-path"])
+    if (nil ~= _571_0) then
+      local filename = _571_0
+      local _572_
       if (opts["compiler-env"] == _G) then
-        local function _572_(...)
+        local function _573_(...)
           return dofile_with_searcher(fennel_macro_searcher, filename, opts, ...)
         end
-        _571_ = _572_
+        _572_ = _573_
       else
-        local function _573_(...)
+        local function _574_(...)
           return utils["fennel-module"].dofile(filename, opts, ...)
         end
-        _571_ = _573_
+        _572_ = _574_
       end
-      return _571_, filename
+      return _572_, filename
     end
   end
   local function lua_macro_searcher(module_name)
-    local _576_0 = search_module(module_name, package.path)
-    if (nil ~= _576_0) then
-      local filename = _576_0
+    local _577_0 = search_module(module_name, package.path)
+    if (nil ~= _577_0) then
+      local filename = _577_0
       local code = nil
       do
         local f = io.open(filename)
@@ -2224,10 +2262,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
             return error(..., 0)
           end
         end
-        local function _578_()
+        local function _579_()
           return assert(f:read("*a"))
         end
-        code = close_handlers_10_(_G.xpcall(_578_, (package.loaded.fennel or debug).traceback))
+        code = close_handlers_10_(_G.xpcall(_579_, (package.loaded.fennel or debug).traceback))
       end
       local chunk = load_code(code, make_compiler_env(), filename)
       return chunk, filename
@@ -2235,35 +2273,38 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local macro_searchers = {fennel_macro_searcher, lua_macro_searcher}
   local function search_macro_module(modname, n)
-    local _580_0 = macro_searchers[n]
-    if (nil ~= _580_0) then
-      local f = _580_0
-      local _581_0, _582_0 = f(modname)
-      if ((nil ~= _581_0) and true) then
-        local loader = _581_0
-        local _3ffilename = _582_0
+    local _581_0 = macro_searchers[n]
+    if (nil ~= _581_0) then
+      local f = _581_0
+      local _582_0, _583_0 = f(modname)
+      if ((nil ~= _582_0) and true) then
+        local loader = _582_0
+        local _3ffilename = _583_0
         return loader, _3ffilename
       else
-        local _ = _581_0
+        local _ = _582_0
         return search_macro_module(modname, (n + 1))
       end
     end
   end
   local function sandbox_fennel_module(modname)
     if ((modname == "fennel.macros") or (package and package.loaded and ("table" == type(package.loaded[modname])) and (package.loaded[modname].metadata == compiler.metadata))) then
-      return {metadata = compiler.metadata, view = view}
+      local function _586_(_, ...)
+        return (compiler.metadata):setall(...)
+      end
+      return {metadata = {setall = _586_}, view = view}
     end
   end
-  local function _586_(modname)
-    local function _587_()
+  local function _588_(modname)
+    local function _589_()
       local loader, filename = search_macro_module(modname, 1)
       compiler.assert(loader, (modname .. " module not found."))
       macro_loaded[modname] = loader(modname, filename)
       return macro_loaded[modname]
     end
-    return (macro_loaded[modname] or sandbox_fennel_module(modname) or _587_())
+    return (macro_loaded[modname] or sandbox_fennel_module(modname) or _589_())
   end
-  safe_require = _586_
+  safe_require = _588_
   local function add_macros(macros_2a, ast, scope)
     compiler.assert(utils["table?"](macros_2a), "expected macros to be table", ast)
     for k, v in pairs(macros_2a) do
@@ -2273,10 +2314,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
     return nil
   end
-  local function resolve_module_name(_588_0, _scope, _parent, opts)
-    local _589_ = _588_0
-    local second = _589_[2]
-    local filename = _589_["filename"]
+  local function resolve_module_name(_590_0, _scope, _parent, opts)
+    local _591_ = _590_0
+    local second = _591_[2]
+    local filename = _591_["filename"]
     local filename0 = (filename or (utils["table?"](second) and second.filename))
     local module_name = utils.root.options["module-name"]
     local modexpr = compiler.compile(second, opts)
@@ -2295,7 +2336,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     if ("import-macros" == tostring(ast[1])) then
       return macro_loaded[modname]
     else
-      return add_macros(macro_loaded[modname], ast, scope, parent)
+      return add_macros(macro_loaded[modname], ast, scope)
     end
   end
   doc_special("require-macros", {"macro-module-name"}, "Load given module and use its contents as macro definitions in current scope.\nMacro module should return a table of macro functions with string keys.\nConsider using import-macros instead as it is more flexible.")
@@ -2333,10 +2374,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           return error(..., 0)
         end
       end
-      local function _595_()
+      local function _597_()
         return assert(f:read("*all")):gsub("[\13\n]*$", "")
       end
-      src = close_handlers_10_(_G.xpcall(_595_, (package.loaded.fennel or debug).traceback))
+      src = close_handlers_10_(_G.xpcall(_597_, (package.loaded.fennel or debug).traceback))
     end
     local ret = utils.expr(("require(\"" .. mod .. "\")"), "statement")
     local target = ("package.preload[%q]"):format(mod)
@@ -2366,12 +2407,12 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "expected one argument", ast)
     local modexpr = nil
     do
-      local _598_0, _599_0 = pcall(resolve_module_name, ast, scope, parent, opts)
-      if ((_598_0 == true) and (nil ~= _599_0)) then
-        local modname = _599_0
+      local _600_0, _601_0 = pcall(resolve_module_name, ast, scope, parent, opts)
+      if ((_600_0 == true) and (nil ~= _601_0)) then
+        local modname = _601_0
         modexpr = utils.expr(string.format("%q", modname), "literal")
       else
-        local _ = _598_0
+        local _ = _600_0
         modexpr = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
       end
     end
@@ -2388,13 +2429,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       utils.root.options["module-name"] = mod
       _ = nil
       local res = nil
-      local function _603_()
-        local _602_0 = search_module(mod)
-        if (nil ~= _602_0) then
-          local fennel_path = _602_0
+      local function _605_()
+        local _604_0 = search_module(mod)
+        if (nil ~= _604_0) then
+          local fennel_path = _604_0
           return include_path(ast, opts, fennel_path, mod, true)
         else
-          local _0 = _602_0
+          local _0 = _604_0
           local lua_path = search_module(mod, package.path)
           if lua_path then
             return include_path(ast, opts, lua_path, mod, false)
@@ -2405,7 +2446,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           end
         end
       end
-      res = ((utils["member?"](mod, (utils.root.options.skipInclude or {})) and opts.fallback(modexpr, true)) or include_circular_fallback(mod, modexpr, opts.fallback, ast) or utils.root.scope.includes[mod] or _603_())
+      res = ((utils["member?"](mod, (utils.root.options.skipInclude or {})) and opts.fallback(modexpr, true)) or include_circular_fallback(mod, modexpr, opts.fallback, ast) or utils.root.scope.includes[mod] or _605_())
       utils.root.options["module-name"] = oldmod
       return res
     end
@@ -2422,9 +2463,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "Expected one table argument", ast)
     local macro_tbl = eval_compiler_2a(ast[2], scope, parent)
     compiler.assert(utils["table?"](macro_tbl), "Expected one table argument", ast)
-    return add_macros(macro_tbl, ast, scope, parent)
+    return add_macros(macro_tbl, ast, scope)
   end
   doc_special("macros", {"{:macro-name-1 (fn [...] ...) ... :macro-name-N macro-body-N}"}, "Define all functions in the given table as macros local to the current scope.")
+  SPECIALS["tail!"] = function(ast, scope, _parent, _609_0)
+    local _610_ = _609_0
+    local tail = _610_["tail"]
+    compiler.assert((#ast == 2), "Expected one argument", ast)
+    compiler.assert(utils["list?"](ast[2]), "Expected a call as argument", ast)
+    compiler.assert(tail, "Must be in tail position", ast)
+    return compiler.compile(ast[2], {nval = 1, scope = scope})
+  end
+  doc_special("tail!", {"body"}, "Assert that the body being called is in tail position.")
   SPECIALS["eval-compiler"] = function(ast, scope, parent)
     local old_first = ast[1]
     ast[1] = utils.sym("do")
@@ -2447,13 +2497,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local scopes = {}
   local function make_scope(_3fparent)
     local parent = (_3fparent or scopes.global)
-    local _261_
+    local _262_
     if parent then
-      _261_ = ((parent.depth or 0) + 1)
+      _262_ = ((parent.depth or 0) + 1)
     else
-      _261_ = 0
+      _262_ = 0
     end
-    return {["gensym-base"] = setmetatable({}, {__index = (parent and parent["gensym-base"])}), autogensyms = setmetatable({}, {__index = (parent and parent.autogensyms)}), depth = _261_, gensyms = setmetatable({}, {__index = (parent and parent.gensyms)}), hashfn = (parent and parent.hashfn), includes = setmetatable({}, {__index = (parent and parent.includes)}), macros = setmetatable({}, {__index = (parent and parent.macros)}), manglings = setmetatable({}, {__index = (parent and parent.manglings)}), parent = parent, refedglobals = {}, specials = setmetatable({}, {__index = (parent and parent.specials)}), symmeta = setmetatable({}, {__index = (parent and parent.symmeta)}), unmanglings = setmetatable({}, {__index = (parent and parent.unmanglings)}), vararg = (parent and parent.vararg)}
+    return {["gensym-base"] = setmetatable({}, {__index = (parent and parent["gensym-base"])}), autogensyms = setmetatable({}, {__index = (parent and parent.autogensyms)}), depth = _262_, gensyms = setmetatable({}, {__index = (parent and parent.gensyms)}), hashfn = (parent and parent.hashfn), includes = setmetatable({}, {__index = (parent and parent.includes)}), macros = setmetatable({}, {__index = (parent and parent.macros)}), manglings = setmetatable({}, {__index = (parent and parent.manglings)}), parent = parent, refedglobals = {}, specials = setmetatable({}, {__index = (parent and parent.specials)}), symmeta = setmetatable({}, {__index = (parent and parent.symmeta)}), unmanglings = setmetatable({}, {__index = (parent and parent.unmanglings)}), vararg = (parent and parent.vararg)}
   end
   local function assert_msg(ast, msg)
     local ast_tbl = nil
@@ -2471,10 +2521,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function assert_compile(condition, msg, ast, _3ffallback_ast)
     if not condition then
-      local _264_ = (utils.root.options or {})
-      local error_pinpoint = _264_["error-pinpoint"]
-      local source = _264_["source"]
-      local unfriendly = _264_["unfriendly"]
+      local _265_ = (utils.root.options or {})
+      local error_pinpoint = _265_["error-pinpoint"]
+      local source = _265_["source"]
+      local unfriendly = _265_["unfriendly"]
       local ast0 = nil
       if next(utils["ast-source"](ast)) then
         ast0 = ast
@@ -2498,33 +2548,33 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   scopes.macro = scopes.global
   local serialize_subst = {["\11"] = "\\v", ["\12"] = "\\f", ["\7"] = "\\a", ["\8"] = "\\b", ["\9"] = "\\t", ["\n"] = "n"}
   local function serialize_string(str)
-    local function _269_(_241)
+    local function _270_(_241)
       return ("\\" .. _241:byte())
     end
-    return string.gsub(string.gsub(string.format("%q", str), ".", serialize_subst), "[\128-\255]", _269_)
+    return string.gsub(string.gsub(string.format("%q", str), ".", serialize_subst), "[\128-\255]", _270_)
   end
   local function global_mangling(str)
     if utils["valid-lua-identifier?"](str) then
       return str
     else
-      local function _270_(_241)
+      local function _271_(_241)
         return string.format("_%02x", _241:byte())
       end
-      return ("__fnl_global__" .. str:gsub("[^%w]", _270_))
+      return ("__fnl_global__" .. str:gsub("[^%w]", _271_))
     end
   end
   local function global_unmangling(identifier)
-    local _272_0 = string.match(identifier, "^__fnl_global__(.*)$")
-    if (nil ~= _272_0) then
-      local rest = _272_0
-      local _273_0 = nil
-      local function _274_(_241)
+    local _273_0 = string.match(identifier, "^__fnl_global__(.*)$")
+    if (nil ~= _273_0) then
+      local rest = _273_0
+      local _274_0 = nil
+      local function _275_(_241)
         return string.char(tonumber(_241:sub(2), 16))
       end
-      _273_0 = string.gsub(rest, "_[%da-f][%da-f]", _274_)
-      return _273_0
+      _274_0 = string.gsub(rest, "_[%da-f][%da-f]", _275_)
+      return _274_0
     else
-      local _ = _272_0
+      local _ = _273_0
       return identifier
     end
   end
@@ -2548,10 +2598,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       raw = str
     end
     local mangling = nil
-    local function _278_(_241)
+    local function _279_(_241)
       return string.format("_%02x", _241:byte())
     end
-    mangling = string.gsub(string.gsub(raw, "-", "_"), "[^%w_]", _278_)
+    mangling = string.gsub(string.gsub(raw, "-", "_"), "[^%w_]", _279_)
     local unique = unique_mangling(mangling, mangling, scope, 0)
     scope.unmanglings[unique] = (scope["gensym-base"][str] or str)
     do
@@ -2606,29 +2656,29 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return table.concat(parts, ".")
   end
   local function autogensym(base, scope)
-    local _282_0 = utils["multi-sym?"](base)
-    if (nil ~= _282_0) then
-      local parts = _282_0
+    local _283_0 = utils["multi-sym?"](base)
+    if (nil ~= _283_0) then
+      local parts = _283_0
       return combine_auto_gensym(parts, autogensym(parts[1], scope))
     else
-      local _ = _282_0
-      local function _283_()
+      local _ = _283_0
+      local function _284_()
         local mangling = gensym(scope, base:sub(1, ( - 2)), "auto")
         scope.autogensyms[base] = mangling
         return mangling
       end
-      return (scope.autogensyms[base] or _283_())
+      return (scope.autogensyms[base] or _284_())
     end
   end
   local function check_binding_valid(symbol, scope, ast, _3fopts)
     local name = tostring(symbol)
     local macro_3f = nil
     do
-      local _285_0 = _3fopts
-      if (nil ~= _285_0) then
-        _285_0 = _285_0["macro?"]
+      local _286_0 = _3fopts
+      if (nil ~= _286_0) then
+        _286_0 = _286_0["macro?"]
       end
-      macro_3f = _285_0
+      macro_3f = _286_0
     end
     assert_compile(not name:find("&"), "invalid character: &", symbol)
     assert_compile(not name:find("^%."), "invalid character: .", symbol)
@@ -2726,22 +2776,22 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function flatten_chunk(file_sourcemap, chunk, tab, depth)
     if chunk.leaf then
-      local _297_ = utils["ast-source"](chunk.ast)
-      local filename = _297_["filename"]
-      local line = _297_["line"]
+      local _298_ = utils["ast-source"](chunk.ast)
+      local filename = _298_["filename"]
+      local line = _298_["line"]
       table.insert(file_sourcemap, {filename, line})
       return chunk.leaf
     else
       local tab0 = nil
       do
-        local _298_0 = tab
-        if (_298_0 == true) then
+        local _299_0 = tab
+        if (_299_0 == true) then
           tab0 = "  "
-        elseif (_298_0 == false) then
+        elseif (_299_0 == false) then
           tab0 = ""
-        elseif (_298_0 == tab) then
+        elseif (_299_0 == tab) then
           tab0 = tab
-        elseif (_298_0 == nil) then
+        elseif (_299_0 == nil) then
           tab0 = ""
         else
         tab0 = nil
@@ -2787,7 +2837,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function make_metadata()
-    local function _306_(self, tgt, _3fkey)
+    local function _307_(self, tgt, _3fkey)
       if self[tgt] then
         if (nil ~= _3fkey) then
           return self[tgt][_3fkey]
@@ -2796,12 +2846,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         end
       end
     end
-    local function _309_(self, tgt, key, value)
+    local function _310_(self, tgt, key, value)
       self[tgt] = (self[tgt] or {})
       self[tgt][key] = value
       return tgt
     end
-    local function _310_(self, tgt, ...)
+    local function _311_(self, tgt, ...)
       local kv_len = select("#", ...)
       local kvs = {...}
       if ((kv_len % 2) ~= 0) then
@@ -2813,7 +2863,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       end
       return tgt
     end
-    return setmetatable({}, {__index = {get = _306_, set = _309_, setall = _310_}, __mode = "k"})
+    return setmetatable({}, {__index = {get = _307_, set = _310_, setall = _311_}, __mode = "k"})
   end
   local function exprs1(exprs)
     return table.concat(utils.map(exprs, tostring), ", ")
@@ -2859,14 +2909,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
     if opts.target then
       local result = exprs1(exprs)
-      local function _318_()
+      local function _319_()
         if (result == "") then
           return "nil"
         else
           return result
         end
       end
-      emit(parent, string.format("%s = %s", opts.target, _318_()), ast)
+      emit(parent, string.format("%s = %s", opts.target, _319_()), ast)
     end
     if (opts.tail or opts.target) then
       return {returned = true}
@@ -2878,16 +2928,16 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local function find_macro(ast, scope)
     local macro_2a = nil
     do
-      local _321_0 = utils["sym?"](ast[1])
-      if (_321_0 ~= nil) then
-        local _322_0 = tostring(_321_0)
-        if (_322_0 ~= nil) then
-          macro_2a = scope.macros[_322_0]
+      local _322_0 = utils["sym?"](ast[1])
+      if (_322_0 ~= nil) then
+        local _323_0 = tostring(_322_0)
+        if (_323_0 ~= nil) then
+          macro_2a = scope.macros[_323_0]
         else
-          macro_2a = _322_0
+          macro_2a = _323_0
         end
       else
-        macro_2a = _321_0
+        macro_2a = _322_0
       end
     end
     local multi_sym_parts = utils["multi-sym?"](ast[1])
@@ -2899,12 +2949,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       return macro_2a
     end
   end
-  local function propagate_trace_info(_326_0, _index, node)
-    local _327_ = _326_0
-    local byteend = _327_["byteend"]
-    local bytestart = _327_["bytestart"]
-    local filename = _327_["filename"]
-    local line = _327_["line"]
+  local function propagate_trace_info(_327_0, _index, node)
+    local _328_ = _327_0
+    local byteend = _328_["byteend"]
+    local bytestart = _328_["bytestart"]
+    local filename = _328_["filename"]
+    local line = _328_["line"]
     do
       local src = utils["ast-source"](node)
       if (("table" == type(node)) and (filename ~= src.filename)) then
@@ -2917,8 +2967,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local function quote_literal_nils(index, node, parent)
     if (parent and utils["list?"](parent)) then
       for i = 1, utils.maxn(parent) do
-        local _329_0 = parent[i]
-        if (_329_0 == nil) then
+        local _330_0 = parent[i]
+        if (_330_0 == nil) then
           parent[i] = utils.sym("nil")
         end
       end
@@ -2926,10 +2976,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return index, node, parent
   end
   local function comp(f, g)
-    local function _332_(...)
+    local function _333_(...)
       return f(g(...))
     end
-    return _332_
+    return _333_
   end
   local function built_in_3f(m)
     local found_3f = false
@@ -2940,36 +2990,36 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return found_3f
   end
   local function macroexpand_2a(ast, scope, _3fonce)
-    local _333_0 = nil
+    local _334_0 = nil
     if utils["list?"](ast) then
-      _333_0 = find_macro(ast, scope)
+      _334_0 = find_macro(ast, scope)
     else
-    _333_0 = nil
+    _334_0 = nil
     end
-    if (_333_0 == false) then
+    if (_334_0 == false) then
       return ast
-    elseif (nil ~= _333_0) then
-      local macro_2a = _333_0
+    elseif (nil ~= _334_0) then
+      local macro_2a = _334_0
       local old_scope = scopes.macro
       local _ = nil
       scopes.macro = scope
       _ = nil
       local ok, transformed = nil, nil
-      local function _335_()
+      local function _336_()
         return macro_2a(unpack(ast, 2))
       end
-      local function _336_()
+      local function _337_()
         if built_in_3f(macro_2a) then
           return tostring
         else
           return debug.traceback
         end
       end
-      ok, transformed = xpcall(_335_, _336_())
-      local function _337_(...)
+      ok, transformed = xpcall(_336_, _337_())
+      local function _338_(...)
         return propagate_trace_info(ast, ...)
       end
-      utils["walk-tree"](transformed, comp(_337_, quote_literal_nils))
+      utils["walk-tree"](transformed, comp(_338_, quote_literal_nils))
       scopes.macro = old_scope
       assert_compile(ok, transformed, ast)
       if (_3fonce or not transformed) then
@@ -2978,7 +3028,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         return macroexpand_2a(transformed, scope)
       end
     else
-      local _ = _333_0
+      local _ = _334_0
       return ast
     end
   end
@@ -3010,13 +3060,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     assert_compile((utils["sym?"](ast[1]) or utils["list?"](ast[1]) or ("string" == type(ast[1]))), ("cannot call literal value " .. tostring(ast[1])), ast)
     for i = 2, len do
       local subexprs = nil
-      local _343_
+      local _344_
       if (i ~= len) then
-        _343_ = 1
+        _344_ = 1
       else
-      _343_ = nil
+      _344_ = nil
       end
-      subexprs = compile1(ast[i], scope, parent, {nval = _343_})
+      subexprs = compile1(ast[i], scope, parent, {nval = _344_})
       table.insert(fargs, subexprs[1])
       if (i == len) then
         for j = 2, #subexprs do
@@ -3054,13 +3104,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function compile_varg(ast, scope, parent, opts)
-    local _348_
+    local _349_
     if scope.hashfn then
-      _348_ = "use $... in hashfn"
+      _349_ = "use $... in hashfn"
     else
-      _348_ = "unexpected vararg"
+      _349_ = "unexpected vararg"
     end
-    assert_compile(scope.vararg, _348_, ast)
+    assert_compile(scope.vararg, _349_, ast)
     return handle_compile_opts({utils.expr("...", "varg")}, parent, opts, ast)
   end
   local function compile_sym(ast, scope, parent, opts)
@@ -3075,20 +3125,20 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return handle_compile_opts({e}, parent, opts, ast)
   end
   local function serialize_number(n)
-    local _351_0 = string.gsub(tostring(n), ",", ".")
-    return _351_0
+    local _352_0 = string.gsub(tostring(n), ",", ".")
+    return _352_0
   end
   local function compile_scalar(ast, _scope, parent, opts)
     local serialize = nil
     do
-      local _352_0 = type(ast)
-      if (_352_0 == "nil") then
+      local _353_0 = type(ast)
+      if (_353_0 == "nil") then
         serialize = tostring
-      elseif (_352_0 == "boolean") then
+      elseif (_353_0 == "boolean") then
         serialize = tostring
-      elseif (_352_0 == "string") then
+      elseif (_353_0 == "string") then
         serialize = serialize_string
-      elseif (_352_0 == "number") then
+      elseif (_353_0 == "number") then
         serialize = serialize_number
       else
       serialize = nil
@@ -3101,8 +3151,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       if ((type(k) == "string") and utils["valid-lua-identifier?"](k)) then
         return k
       else
-        local _354_ = compile1(k, scope, parent, {nval = 1})
-        local compiled = _354_[1]
+        local _355_ = compile1(k, scope, parent, {nval = 1})
+        local compiled = _355_[1]
         return ("[" .. tostring(compiled) .. "]")
       end
     end
@@ -3128,12 +3178,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     do
       local tbl_17_ = buffer
       local i_18_ = #tbl_17_
-      for k, v in utils.stablepairs(ast) do
+      for k in utils.stablepairs(ast) do
         local val_19_ = nil
         if not keys[k] then
-          local _357_ = compile1(ast[k], scope, parent, {nval = 1})
-          local v0 = _357_[1]
-          val_19_ = string.format("%s = %s", escape_key(k), tostring(v0))
+          local _358_ = compile1(ast[k], scope, parent, {nval = 1})
+          local v = _358_[1]
+          val_19_ = string.format("%s = %s", escape_key(k), tostring(v))
         else
         val_19_ = nil
         end
@@ -3164,12 +3214,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function destructure(to, from, ast, scope, parent, opts)
     local opts0 = (opts or {})
-    local _361_ = opts0
-    local declaration = _361_["declaration"]
-    local forceglobal = _361_["forceglobal"]
-    local forceset = _361_["forceset"]
-    local isvar = _361_["isvar"]
-    local symtype = _361_["symtype"]
+    local _362_ = opts0
+    local declaration = _362_["declaration"]
+    local forceglobal = _362_["forceglobal"]
+    local forceset = _362_["forceset"]
+    local isvar = _362_["isvar"]
+    local symtype = _362_["symtype"]
     local symtype0 = ("_" .. (symtype or "dst"))
     local setter = nil
     if declaration then
@@ -3185,8 +3235,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         return declare_local(symbol, nil, scope, symbol, new_manglings)
       else
         local parts = (utils["multi-sym?"](raw) or {raw})
-        local _363_ = parts
-        local first = _363_[1]
+        local _364_ = parts
+        local first = _364_[1]
         local meta = scope.symmeta[first]
         assert_compile(not raw:find(":"), "cannot set method sym", symbol)
         if ((#parts == 1) and not forceset) then
@@ -3207,14 +3257,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
     local function compile_top_target(lvalues)
       local inits = nil
-      local function _368_(_241)
+      local function _369_(_241)
         if scope.manglings[_241] then
           return _241
         else
           return "nil"
         end
       end
-      inits = utils.map(lvalues, _368_)
+      inits = utils.map(lvalues, _369_)
       local init = table.concat(inits, ", ")
       local lvalue = table.concat(lvalues, ", ")
       local plast = parent[#parent]
@@ -3252,7 +3302,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     local unpack_fn = "function (t, k, e)\n                        local mt = getmetatable(t)\n                        if 'table' == type(mt) and mt.__fennelrest then\n                          return mt.__fennelrest(t, k)\n                        elseif e then\n                          local rest = {}\n                          for k, v in pairs(t) do\n                            if not e[k] then rest[k] = v end\n                          end\n                          return rest\n                        else\n                          return {(table.unpack or unpack)(t, k)}\n                        end\n                      end"
     local function destructure_kv_rest(s, v, left, excluded_keys, destructure1)
       local exclude_str = nil
-      local _375_
+      local _376_
       do
         local tbl_17_ = {}
         local i_18_ = #tbl_17_
@@ -3263,9 +3313,9 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
             tbl_17_[i_18_] = val_19_
           end
         end
-        _375_ = tbl_17_
+        _376_ = tbl_17_
       end
-      exclude_str = table.concat(_375_, ", ")
+      exclude_str = table.concat(_376_, ", ")
       local subexpr = utils.expr(string.format(string.gsub(("(" .. unpack_fn .. ")(%s, %s, {%s})"), "\n%s*", " "), s, tostring(v), exclude_str), "expression")
       return destructure1(v, {subexpr}, left)
     end
@@ -3280,16 +3330,16 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       local s = gensym(scope, symtype0)
       local right = nil
       do
-        local _377_0 = nil
+        local _378_0 = nil
         if top_3f then
-          _377_0 = exprs1(compile1(from, scope, parent))
+          _378_0 = exprs1(compile1(from, scope, parent))
         else
-          _377_0 = exprs1(rightexprs)
+          _378_0 = exprs1(rightexprs)
         end
-        if (_377_0 == "") then
+        if (_378_0 == "") then
           right = "nil"
-        elseif (nil ~= _377_0) then
-          local right0 = _377_0
+        elseif (nil ~= _378_0) then
+          local right0 = _378_0
           right = right0
         else
         right = nil
@@ -3394,8 +3444,11 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     if opts.requireAsInclude then
       scope.specials.require = require_include
     end
-    local _391_ = utils.root
-    _391_["set-reset"](_391_)
+    if opts.assertAsRepl then
+      scope.macros.assert = scope.macros["assert-repl"]
+    end
+    local _393_ = utils.root
+    _393_["set-reset"](_393_)
     utils.root.chunk, utils.root.scope, utils.root.options = chunk, scope, opts
     for i = 1, #asts do
       local exprs = compile1(asts[i], scope, chunk, {nval = (((i < #asts) and 0) or nil), tail = (i == #asts)})
@@ -3446,14 +3499,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         info.currentline = (remap[info.currentline][2] or -1)
       end
       if (info.what == "Lua") then
-        local function _396_()
+        local function _398_()
           if info.name then
             return ("'" .. info.name .. "'")
           else
             return "?"
           end
         end
-        return string.format("  %s:%d: in function %s", info.short_src, info.currentline, _396_())
+        return string.format("  %s:%d: in function %s", info.short_src, info.currentline, _398_())
       elseif (info.short_src == "(tail call)") then
         return "  (tail call)"
       else
@@ -3477,11 +3530,11 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       local done_3f, level = false, (_3fstart or 2)
       while not done_3f do
         do
-          local _400_0 = debug.getinfo(level, "Sln")
-          if (_400_0 == nil) then
+          local _402_0 = debug.getinfo(level, "Sln")
+          if (_402_0 == nil) then
             done_3f = true
-          elseif (nil ~= _400_0) then
-            local info = _400_0
+          elseif (nil ~= _402_0) then
+            local info = _402_0
             table.insert(lines, traceback_frame(info))
           end
         end
@@ -3491,14 +3544,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function entry_transform(fk, fv)
-    local function _403_(k, v)
+    local function _405_(k, v)
       if (type(k) == "number") then
         return k, fv(v)
       else
         return fk(k), fv(v)
       end
     end
-    return _403_
+    return _405_
   end
   local function mixed_concat(t, joiner)
     local seen = {}
@@ -3543,10 +3596,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       return res[1]
     elseif utils["list?"](form) then
       local mapped = nil
-      local function _408_()
+      local function _410_()
         return nil
       end
-      mapped = utils.kvmap(form, entry_transform(_408_, q))
+      mapped = utils.kvmap(form, entry_transform(_410_, q))
       local filename = nil
       if form.filename then
         filename = string.format("%q", form.filename)
@@ -3564,13 +3617,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       else
         filename = "nil"
       end
-      local _411_
+      local _413_
       if source then
-        _411_ = source.line
+        _413_ = source.line
       else
-        _411_ = "nil"
+        _413_ = "nil"
       end
-      return string.format("setmetatable({%s}, {filename=%s, line=%s, sequence=%s})", mixed_concat(mapped, ", "), filename, _411_, "(getmetatable(sequence()))['sequence']")
+      return string.format("setmetatable({%s}, {filename=%s, line=%s, sequence=%s})", mixed_concat(mapped, ", "), filename, _413_, "(getmetatable(sequence()))['sequence']")
     elseif (type(form) == "table") then
       local mapped = utils.kvmap(form, entry_transform(q, q))
       local source = getmetatable(form)
@@ -3580,14 +3633,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       else
         filename = "nil"
       end
-      local function _414_()
+      local function _416_()
         if source then
           return source.line
         else
           return "nil"
         end
       end
-      return string.format("setmetatable({%s}, {filename=%s, line=%s})", mixed_concat(mapped, ", "), filename, _414_())
+      return string.format("setmetatable({%s}, {filename=%s, line=%s})", mixed_concat(mapped, ", "), filename, _416_())
     elseif (type(form) == "string") then
       return serialize_string(form)
     else
@@ -3809,7 +3862,9 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       else
         r = getbyte({["stack-size"] = #stack})
       end
-      byteindex = (byteindex + 1)
+      if r then
+        byteindex = (byteindex + 1)
+      end
       if (r and char_starter_3f(r)) then
         col = (col + 1)
       end
@@ -3819,14 +3874,14 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       return r
     end
     local function whitespace_3f(b)
-      local function _216_()
-        local _215_0 = options.whitespace
-        if (nil ~= _215_0) then
-          _215_0 = _215_0[b]
+      local function _217_()
+        local _216_0 = options.whitespace
+        if (nil ~= _216_0) then
+          _216_0 = _216_0[b]
         end
-        return _215_0
+        return _216_0
       end
-      return ((b == 32) or ((9 <= b) and (b <= 13)) or _216_())
+      return ((b == 32) or ((9 <= b) and (b <= 13)) or _217_())
     end
     local function parse_error(msg, _3fcol_adjust)
       local col0 = (col + (_3fcol_adjust or -1))
@@ -3846,25 +3901,25 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         return nil
       end
       local function dispatch(v)
-        local _220_0 = stack[#stack]
-        if (_220_0 == nil) then
+        local _221_0 = stack[#stack]
+        if (_221_0 == nil) then
           retval, done_3f, whitespace_since_dispatch = v, true, false
           return nil
-        elseif ((_G.type(_220_0) == "table") and (nil ~= _220_0.prefix)) then
-          local prefix = _220_0.prefix
+        elseif ((_G.type(_221_0) == "table") and (nil ~= _221_0.prefix)) then
+          local prefix = _221_0.prefix
           local source0 = nil
           do
-            local _221_0 = table.remove(stack)
-            set_source_fields(_221_0)
-            source0 = _221_0
+            local _222_0 = table.remove(stack)
+            set_source_fields(_222_0)
+            source0 = _222_0
           end
           local list = utils.list(utils.sym(prefix, source0), v)
           for k, v0 in pairs(source0) do
             list[k] = v0
           end
           return dispatch(list)
-        elseif (nil ~= _220_0) then
-          local top = _220_0
+        elseif (nil ~= _221_0) then
+          local top = _221_0
           whitespace_since_dispatch = false
           return table.insert(top, v)
         end
@@ -3872,13 +3927,13 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       local close_table = nil
       local function badend(cause)
         local accum = utils.map(stack, "closer")
-        local _223_
+        local _224_
         if (#stack == 1) then
-          _223_ = ""
+          _224_ = ""
         else
-          _223_ = "s"
+          _224_ = "s"
         end
-        parse_error(string.format("expected closing delimiter%s %s", _223_, string.char(unpack(accum))))
+        parse_error(string.format("expected closing delimiter%s %s", _224_, string.char(unpack(accum))))
         if (cause == "eof") then
           for i = #accum, 2, -1 do
             close_table(accum[i])
@@ -3898,11 +3953,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       end
       local function parse_comment(b, contents)
         if (b and (10 ~= b)) then
-          local function _227_()
+          local function _228_()
             table.insert(contents, string.char(b))
             return contents
           end
-          return parse_comment(getb(), _227_())
+          return parse_comment(getb(), _228_())
         elseif comments then
           ungetb(10)
           return dispatch(utils.comment(table.concat(contents), {filename = filename, line = line}))
@@ -3928,12 +3983,12 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         return dispatch(setmetatable(tbl, mt))
       end
       local function add_comment_at(comments0, index, node)
-        local _231_0 = comments0[index]
-        if (nil ~= _231_0) then
-          local existing = _231_0
+        local _232_0 = comments0[index]
+        if (nil ~= _232_0) then
+          local existing = _232_0
           return table.insert(existing, node)
         else
-          local _ = _231_0
+          local _ = _232_0
           comments0[index] = {node}
           return nil
         end
@@ -4013,16 +4068,16 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         end
         local state0 = nil
         do
-          local _242_0 = {state, b}
-          if ((_G.type(_242_0) == "table") and (_242_0[1] == "base") and (_242_0[2] == 92)) then
+          local _243_0 = {state, b}
+          if ((_G.type(_243_0) == "table") and (_243_0[1] == "base") and (_243_0[2] == 92)) then
             state0 = "backslash"
-          elseif ((_G.type(_242_0) == "table") and (_242_0[1] == "base") and (_242_0[2] == 34)) then
+          elseif ((_G.type(_243_0) == "table") and (_243_0[1] == "base") and (_243_0[2] == 34)) then
             state0 = "done"
-          elseif ((_G.type(_242_0) == "table") and (_242_0[1] == "backslash") and (_242_0[2] == 10)) then
+          elseif ((_G.type(_243_0) == "table") and (_243_0[1] == "backslash") and (_243_0[2] == 10)) then
             table.remove(chars, (#chars - 1))
             state0 = "base"
           else
-            local _ = _242_0
+            local _ = _243_0
             state0 = "base"
           end
         end
@@ -4044,11 +4099,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         table.remove(stack)
         local raw = table.concat(chars)
         local formatted = raw:gsub("[\7-\13]", escape_char)
-        local _246_0 = (rawget(_G, "loadstring") or load)(("return " .. formatted))
-        if (nil ~= _246_0) then
-          local load_fn = _246_0
+        local _247_0 = (rawget(_G, "loadstring") or load)(("return " .. formatted))
+        if (nil ~= _247_0) then
+          local load_fn = _247_0
           return dispatch(load_fn())
-        elseif (_246_0 == nil) then
+        elseif (_247_0 == nil) then
           return parse_error(("Invalid string: " .. raw))
         end
       end
@@ -4081,13 +4136,13 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
           dispatch((tonumber(number_with_stripped_underscores) or parse_error(("could not read number \"" .. rawstr .. "\""))))
           return true
         else
-          local _252_0 = tonumber(number_with_stripped_underscores)
-          if (nil ~= _252_0) then
-            local x = _252_0
+          local _253_0 = tonumber(number_with_stripped_underscores)
+          if (nil ~= _253_0) then
+            local x = _253_0
             dispatch(x)
             return true
           else
-            local _ = _252_0
+            local _ = _253_0
             return false
           end
         end
@@ -4134,7 +4189,7 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         elseif delims[b] then
           close_table0(b)
         elseif (b == 34) then
-          parse_string(b)
+          parse_string()
         elseif prefixes[b] then
           parse_prefix(b)
         elseif (sym_char_3f(b) or (b == string.byte("~"))) then
@@ -4152,11 +4207,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       end
       return parse_loop(skip_whitespace(getb()))
     end
-    local function _259_()
+    local function _260_()
       stack, line, byteindex, col, lastb = {}, 1, 0, 0, nil
       return nil
     end
-    return parse_stream, _259_
+    return parse_stream, _260_
   end
   local function parser(stream_or_string, _3ffilename, _3foptions)
     local filename = (_3ffilename or "unknown")
@@ -4788,7 +4843,7 @@ package.preload["fennel.view"] = package.preload["fennel.view"] or function(...)
 end
 package.preload["fennel.utils"] = package.preload["fennel.utils"] or function(...)
   local view = require("fennel.view")
-  local version = "1.3.2-dev"
+  local version = "1.4.0-dev"
   local function luajit_vm_3f()
     return ((nil ~= _G.jit) and (type(_G.jit) == "table") and (nil ~= _G.jit.on) and (nil ~= _G.jit.off) and (type(_G.jit.version_num) == "number"))
   end
@@ -5256,7 +5311,8 @@ package.preload["fennel.utils"] = package.preload["fennel.utils"] or function(..
     return symbol.quoted
   end
   local function idempotent_expr_3f(x)
-    return ((type(x) == "string") or (type(x) == "integer") or (type(x) == "number") or (sym_3f(x) and not multi_sym_3f(x)))
+    local t = type(x)
+    return ((t == "string") or (t == "integer") or (t == "number") or (t == "boolean") or (sym_3f(x) and not multi_sym_3f(x)))
   end
   local function ast_source(ast)
     if (table_3f(ast) or sequence_3f(ast)) then
@@ -5391,14 +5447,14 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
     local env = eval_env(opts.env, opts)
     local lua_source = compiler["compile-string"](str, opts)
     local loader = nil
-    local function _735_(...)
+    local function _746_(...)
       if opts.filename then
         return ("@" .. opts.filename)
       else
         return str
       end
     end
-    loader = specials["load-code"](lua_source, env, _735_(...))
+    loader = specials["load-code"](lua_source, env, _746_(...))
     opts.filename = nil
     return loader(...)
   end
@@ -5423,10 +5479,10 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
       out[k] = {["binding-form?"] = utils["member?"](k, binding_3f), ["body-form?"] = utils["member?"](k, body_3f), ["define?"] = utils["member?"](k, define_3f), ["macro?"] = true}
     end
     for k, v in pairs(_G) do
-      local _736_0 = type(v)
-      if (_736_0 == "function") then
+      local _747_0 = type(v)
+      if (_747_0 == "function") then
         out[k] = {["function?"] = true, ["global?"] = true}
-      elseif (_736_0 == "table") then
+      elseif (_747_0 == "table") then
         for k2, v2 in pairs(v) do
           if (("function" == type(v2)) and (k ~= "_G")) then
             out[(k .. "." .. k2)] = {["function?"] = true, ["global?"] = true}
@@ -5446,19 +5502,21 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
   do
     local module_name = "fennel.macros"
     local _ = nil
-    local function _739_()
+    local function _750_()
       return mod
     end
-    package.preload[module_name] = _739_
+    package.preload[module_name] = _750_
     _ = nil
     local env = nil
     do
-      local _740_0 = specials["make-compiler-env"](nil, compiler.scopes.compiler, {})
-      _740_0["utils"] = utils
-      _740_0["fennel"] = mod
-      env = _740_0
+      local _751_0 = specials["make-compiler-env"](nil, compiler.scopes.compiler, {})
+      _751_0["utils"] = utils
+      _751_0["fennel"] = mod
+      env = _751_0
     end
-    local built_ins = eval([===[;; These macros are awkward because their definition cannot rely on the any
+    local built_ins = eval([===[;; fennel-ls: macro-file
+    
+    ;; These macros are awkward because their definition cannot rely on the any
     ;; built-in macros, only special forms. (no when, no icollect, etc)
     
     (fn copy [t]
@@ -5581,7 +5639,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
                 (table.remove iter-out i)))))
       (assert (or (not found?) (sym? into) (table? into) (list? into))
               "expected table, function call, or symbol in &into clause")
-      (values into iter-out))
+      (values into iter-out found?))
     
     (fn collect* [iter-tbl key-expr value-expr ...]
       "Return a table made by running an iterator and evaluating an expression that
@@ -5619,17 +5677,22 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
       (assert (not= nil value-expr) "expected table value expression")
       (assert (= nil ...)
               "expected exactly one body expression. Wrap multiple expressions in do")
-      (let [(into iter) (extract-into iter-tbl)]
-        `(let [tbl# ,into]
-           ;; believe it or not, using a var here has a pretty good performance
-           ;; boost: https://p.hagelb.org/icollect-performance.html
-           (var i# (length tbl#))
-           (,how ,iter
-                 (let [val# ,value-expr]
-                   (when (not= nil val#)
-                     (set i# (+ i# 1))
-                     (tset tbl# i# val#))))
-           tbl#)))
+      (let [(into iter has-into?) (extract-into iter-tbl)]
+        (if has-into?
+            `(let [tbl# ,into]
+               (,how ,iter (table.insert tbl# ,value-expr))
+               tbl#)
+            ;; believe it or not, using a var here has a pretty good performance
+            ;; boost: https://p.hagelb.org/icollect-performance.html
+            ;; but it doesn't always work with &into clauses, so skip if that's used
+            `(let [tbl# []]
+               (var i# 0)
+               (,how ,iter
+                     (let [val# ,value-expr]
+                       (when (not= nil val#)
+                         (set i# (+ i# 1))
+                         (tset tbl# i# val#))))
+               tbl#))))
     
     (fn icollect* [iter-tbl value-expr ...]
       "Return a sequential table made by running an iterator and evaluating an
@@ -5763,7 +5826,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
               (.. "Expected n to be an integer >= 0, got " (tostring n)))
       (let [let-syms (list)
             let-values (if (= 1 (select "#" ...)) ... `(values ,...))]
-        (for [i 1 n]
+        (for [_ 1 n]
           (table.insert let-syms (gensym)))
         (if (= n 0) `(values)
             `(let [,let-syms ,let-values]
@@ -5848,6 +5911,30 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
                 (tset scope.macros import-key (. macros* macro-name))))))
       nil)
     
+    (fn assert-repl* [condition message ?opts]
+      "Drop into a debug repl and print the message when condition is false/nil.
+    Takes an optional table of arguments which will be passed to fennel.repl."
+      (fn add-locals [{: symmeta : parent} locals]
+        (each [name (pairs symmeta)]
+          (tset locals name (sym name)))
+        (if parent (add-locals parent locals) locals))
+      `(let [condition# ,condition
+             message# (or ,message "assertion failed, entering repl.")]
+         (if (not condition#)
+             (let [opts# (or ,?opts {:assert-repl? true
+                                     :readChunk (?. _G :___repl___ :readChunk)
+                                     :onError (?. _G :___repl___ :onError)
+                                     :onValued (?. _G :___repl___ :onValued)})
+                   fennel# (require (or opts#.moduleName :fennel))
+                   locals# ,(add-locals (get-scope) [])]
+               (set opts#.message (fennel#.traceback message#))
+               (set opts#.env (collect [k# v# (pairs _G) &into locals#]
+                                (if (= nil (. locals# k#)) (values k# v#))))
+               (_G.assert (fennel#.repl opts#) message#))
+             ;; `assert` returns *all* params on success, but omitting opts# to
+             ;; defensively prevent accidental leakage of REPL opts into code
+             (values condition# message#))))
+    
     {:-> ->*
      :->> ->>*
      :-?> -?>*
@@ -5868,14 +5955,17 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
      :pick-values pick-values*
      :macro macro*
      :macrodebug macrodebug*
-     :import-macros import-macros*}
+     :import-macros import-macros*
+     :assert-repl assert-repl*}
     ]===], {env = env, filename = "src/fennel/macros.fnl", moduleName = module_name, scope = compiler.scopes.compiler, useMetadata = true})
     local _0 = nil
     for k, v in pairs(built_ins) do
       compiler.scopes.global.macros[k] = v
     end
     _0 = nil
-    local match_macros = eval([===[;;; Pattern matching
+    local match_macros = eval([===[;; fennel-ls: macro-file
+    
+    ;;; Pattern matching
     ;; This is separated out so we can use the "core" macros during the
     ;; implementation of pattern matching.
     
@@ -5978,7 +6068,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
                        (let [in-pattern (symbols-in-pattern pattern)]
                          (if ?symbols
                            (do
-                             (each [name symbol (pairs ?symbols)]
+                             (each [name (pairs ?symbols)]
                                (when (not (. in-pattern name))
                                  (tset ?symbols name nil)))
                              ?symbols)
@@ -5994,7 +6084,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
         (if (= 0 (length bindings))
           ;; no bindings special case generates simple code
           (let [condition
-                (icollect [i subpattern (ipairs pattern) &into `(or)]
+                (icollect [_ subpattern (ipairs pattern) &into `(or)]
                   (let [(subcondition subbindings) (case-pattern vals subpattern unifications opts)]
                     subcondition))]
             (values
@@ -6007,7 +6097,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
                 bindings-mangled (icollect [_ binding (ipairs bindings)]
                                    (gensym (tostring binding)))
                 pre-bindings `(if)]
-            (each [i subpattern (ipairs pattern)]
+            (each [_ subpattern (ipairs pattern)]
               (let [(subcondition subbindings) (case-guard vals subpattern guards {} case-pattern opts)]
                 (table.insert pre-bindings subcondition)
                 (table.insert pre-bindings `(let ,subbindings
@@ -6173,7 +6263,7 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
           (case-condition (list val) clauses match?)
           ;; protect against multiple evaluation of the value, bind against as
           ;; many values as we ever match against in the clauses.
-          (let [vals (fcollect [i 1 vals-count &into (list)] (gensym))]
+          (let [vals (fcollect [_ 1 vals-count &into (list)] (gensym))]
             (list `let [vals val] (case-condition vals clauses match?))))))
     
     (fn case* [val ...]
@@ -6269,20 +6359,20 @@ package.preload["fennel"] = package.preload["fennel"] or function(...)
 end
 fennel = require("fennel")
 local unpack = (table.unpack or _G.unpack)
-local help = "\nUsage: fennel [FLAG] [FILE]\n\nRun fennel, a lisp programming language for the Lua runtime.\n\n  --repl                   : Command to launch an interactive repl session\n  --compile FILES (-c)     : Command to AOT compile files, writing Lua to stdout\n  --eval SOURCE (-e)       : Command to evaluate source code and print result\n\n  --no-searcher            : Skip installing package.searchers entry\n  --indent VAL             : Indent compiler output with VAL\n  --add-package-path PATH  : Add PATH to package.path for finding Lua modules\n  --add-package-cpath PATH : Add PATH to package.cpath for finding Lua modules\n  --add-fennel-path PATH   : Add PATH to fennel.path for finding Fennel modules\n  --add-macro-path PATH    : Add PATH to fennel.macro-path for macro modules\n  --globals G1[,G2...]     : Allow these globals in addition to standard ones\n  --globals-only G1[,G2]   : Same as above, but exclude standard ones\n  --require-as-include     : Inline required modules in the output\n  --skip-include M1[,M2]   : Omit certain modules from output when included\n  --use-bit-lib            : Use LuaJITs bit library instead of operators\n  --metadata               : Enable function metadata, even in compiled output\n  --no-metadata            : Disable function metadata, even in REPL\n  --correlate              : Make Lua output line numbers match Fennel input\n  --load FILE (-l)         : Load the specified FILE before executing command\n  --lua LUA_EXE            : Run in a child process with LUA_EXE\n  --no-fennelrc            : Skip loading ~/.fennelrc when launching repl\n  --raw-errors             : Disable friendly compile error reporting\n  --plugin FILE            : Activate the compiler plugin in FILE\n  --compile-binary FILE\n      OUT LUA_LIB LUA_DIR  : Compile FILE to standalone binary OUT\n  --compile-binary --help  : Display further help for compiling binaries\n  --no-compiler-sandbox    : Don't limit compiler environment to minimal sandbox\n\n  --help (-h)              : Display this text\n  --version (-v)           : Show version\n\nGlobals are not checked when doing AOT (ahead-of-time) compilation unless\nthe --globals-only or --globals flag is provided. Use --globals \"*\" to disable\nstrict globals checking in other contexts.\n\nMetadata is typically considered a development feature and is not recommended\nfor production. It is used for docstrings and enabled by default in the REPL.\n\nWhen not given a command, runs the file given as the first argument.\nWhen given neither command nor file, launches a repl.\n\nUse the NO_COLOR environment variable to disable escape codes in error messages.\n\nIf ~/.fennelrc exists, it will be loaded before launching a repl."
+local help = "\nUsage: fennel [FLAG] [FILE]\n\nRun fennel, a lisp programming language for the Lua runtime.\n\n  --repl                   : Command to launch an interactive repl session\n  --compile FILES (-c)     : Command to AOT compile files, writing Lua to stdout\n  --eval SOURCE (-e)       : Command to evaluate source code and print result\n\n  --correlate              : Make Lua output line numbers match Fennel input\n  --load FILE (-l)         : Load the specified FILE before executing command\n  --no-compiler-sandbox    : Don't limit compiler environment to minimal sandbox\n  --compile-binary FILE\n      OUT LUA_LIB LUA_DIR  : Compile FILE to standalone binary OUT\n  --compile-binary --help  : Display further help for compiling binaries\n  --add-package-path PATH  : Add PATH to package.path for finding Lua modules\n  --add-package-cpath PATH : Add PATH to package.cpath for finding Lua modules\n  --add-fennel-path PATH   : Add PATH to fennel.path for finding Fennel modules\n  --add-macro-path PATH    : Add PATH to fennel.macro-path for macro modules\n  --globals G1[,G2...]     : Allow these globals in addition to standard ones\n  --globals-only G1[,G2]   : Same as above, but exclude standard ones\n  --assert-as-repl         : Replace assert calls with assert-repl\n  --require-as-include     : Inline required modules in the output\n  --skip-include M1[,M2]   : Omit certain modules from output when included\n  --use-bit-lib            : Use LuaJITs bit library instead of operators\n  --metadata               : Enable function metadata, even in compiled output\n  --no-metadata            : Disable function metadata, even in REPL\n  --lua LUA_EXE            : Run in a child process with LUA_EXE\n  --plugin FILE            : Activate the compiler plugin in FILE\n  --raw-errors             : Disable friendly compile error reporting\n  --no-searcher            : Skip installing package.searchers entry\n  --no-fennelrc            : Skip loading ~/.fennelrc when launching repl\n\n  --help (-h)              : Display this text\n  --version (-v)           : Show version\n\nGlobals are not checked when doing AOT (ahead-of-time) compilation unless\nthe --globals-only or --globals flag is provided. Use --globals \"*\" to disable\nstrict globals checking in other contexts.\n\nMetadata is typically considered a development feature and is not recommended\nfor production. It is used for docstrings and enabled by default in the REPL.\n\nWhen not given a command, runs the file given as the first argument.\nWhen given neither command nor file, launches a repl.\n\nUse the NO_COLOR environment variable to disable escape codes in error messages.\n\nIf ~/.fennelrc exists, it will be loaded before launching a repl."
 local options = {plugins = {}}
 local function pack(...)
-  local _741_0 = {...}
-  _741_0["n"] = select("#", ...)
-  return _741_0
+  local _752_0 = {...}
+  _752_0["n"] = select("#", ...)
+  return _752_0
 end
 local function dosafely(f, ...)
   local args = {...}
   local result = nil
-  local function _742_()
+  local function _753_()
     return f(unpack(args))
   end
-  result = pack(xpcall(_742_, fennel.traceback))
+  result = pack(xpcall(_753_, fennel.traceback))
   if not result[1] then
     do end (io.stderr):write((result[2] .. "\n"))
     os.exit(1)
@@ -6327,19 +6417,18 @@ local function handle_lua(i)
   if (nil == arg[-1]) then
     do end (io.stderr):write("WARNING: --lua argument only works from script, not binary.\n")
   end
-  local ok = os.execute(table.concat(cmd, " "))
-  local _747_
-  if ok then
-    _747_ = 0
+  local _758_0, _759_0 = os.execute(table.concat(cmd, " "))
+  if (((_758_0 == true) and (_759_0 == "exit")) or (_758_0 == 0)) then
+    return os.exit(0, true)
   else
-    _747_ = 1
+    local _ = _758_0
+    return os.exit(1, true)
   end
-  return os.exit(_747_, true)
 end
 assert(arg, "Using the launcher from non-CLI context; use fennel.lua instead.")
 for i = #arg, 1, -1 do
-  local _749_0 = arg[i]
-  if (_749_0 == "--lua") then
+  local _761_0 = arg[i]
+  if (_761_0 == "--lua") then
     handle_lua(i)
   end
 end
@@ -6347,55 +6436,58 @@ do
   local commands = {["-"] = true, ["--compile"] = true, ["--compile-binary"] = true, ["--eval"] = true, ["--help"] = true, ["--repl"] = true, ["--version"] = true, ["-c"] = true, ["-e"] = true, ["-h"] = true, ["-v"] = true}
   local i = 1
   while (arg[i] and not options["ignore-options"]) do
-    local _751_0 = arg[i]
-    if (_751_0 == "--no-searcher") then
+    local _763_0 = arg[i]
+    if (_763_0 == "--no-searcher") then
       options["no-searcher"] = true
       table.remove(arg, i)
-    elseif (_751_0 == "--indent") then
+    elseif (_763_0 == "--indent") then
       options.indent = table.remove(arg, (i + 1))
       if (options.indent == "false") then
         options.indent = false
       end
       table.remove(arg, i)
-    elseif (_751_0 == "--add-package-path") then
+    elseif (_763_0 == "--add-package-path") then
       local entry = table.remove(arg, (i + 1))
       package.path = (entry .. ";" .. package.path)
       table.remove(arg, i)
-    elseif (_751_0 == "--add-package-cpath") then
+    elseif (_763_0 == "--add-package-cpath") then
       local entry = table.remove(arg, (i + 1))
       package.cpath = (entry .. ";" .. package.cpath)
       table.remove(arg, i)
-    elseif (_751_0 == "--add-fennel-path") then
+    elseif (_763_0 == "--add-fennel-path") then
       local entry = table.remove(arg, (i + 1))
       fennel.path = (entry .. ";" .. fennel.path)
       table.remove(arg, i)
-    elseif (_751_0 == "--add-macro-path") then
+    elseif (_763_0 == "--add-macro-path") then
       local entry = table.remove(arg, (i + 1))
       fennel["macro-path"] = (entry .. ";" .. fennel["macro-path"])
       table.remove(arg, i)
-    elseif (_751_0 == "--load") then
+    elseif (_763_0 == "--load") then
       handle_load(i)
-    elseif (_751_0 == "-l") then
+    elseif (_763_0 == "-l") then
       handle_load(i)
-    elseif (_751_0 == "--no-fennelrc") then
+    elseif (_763_0 == "--no-fennelrc") then
       options.fennelrc = false
       table.remove(arg, i)
-    elseif (_751_0 == "--correlate") then
+    elseif (_763_0 == "--correlate") then
       options.correlate = true
       table.remove(arg, i)
-    elseif (_751_0 == "--check-unused-locals") then
+    elseif (_763_0 == "--check-unused-locals") then
       options.checkUnusedLocals = true
       table.remove(arg, i)
-    elseif (_751_0 == "--globals") then
+    elseif (_763_0 == "--globals") then
       allow_globals(table.remove(arg, (i + 1)), _G)
       table.remove(arg, i)
-    elseif (_751_0 == "--globals-only") then
+    elseif (_763_0 == "--globals-only") then
       allow_globals(table.remove(arg, (i + 1)), {})
       table.remove(arg, i)
-    elseif (_751_0 == "--require-as-include") then
+    elseif (_763_0 == "--require-as-include") then
       options.requireAsInclude = true
       table.remove(arg, i)
-    elseif (_751_0 == "--skip-include") then
+    elseif (_763_0 == "--assert-as-repl") then
+      options.assertAsRepl = true
+      table.remove(arg, i)
+    elseif (_763_0 == "--skip-include") then
       local skip_names = table.remove(arg, (i + 1))
       local skip = nil
       do
@@ -6412,28 +6504,28 @@ do
       end
       options.skipInclude = skip
       table.remove(arg, i)
-    elseif (_751_0 == "--use-bit-lib") then
+    elseif (_763_0 == "--use-bit-lib") then
       options.useBitLib = true
       table.remove(arg, i)
-    elseif (_751_0 == "--metadata") then
+    elseif (_763_0 == "--metadata") then
       options.useMetadata = true
       table.remove(arg, i)
-    elseif (_751_0 == "--no-metadata") then
+    elseif (_763_0 == "--no-metadata") then
       options.useMetadata = false
       table.remove(arg, i)
-    elseif (_751_0 == "--no-compiler-sandbox") then
+    elseif (_763_0 == "--no-compiler-sandbox") then
       options["compiler-env"] = _G
       table.remove(arg, i)
-    elseif (_751_0 == "--raw-errors") then
+    elseif (_763_0 == "--raw-errors") then
       options.unfriendly = true
       table.remove(arg, i)
-    elseif (_751_0 == "--plugin") then
+    elseif (_763_0 == "--plugin") then
       local opts = {["compiler-env"] = _G, env = "_COMPILER", useMetadata = true}
       local plugin = fennel.dofile(table.remove(arg, (i + 1)), opts)
       table.insert(options.plugins, 1, plugin)
       table.remove(arg, i)
     else
-      local _ = _751_0
+      local _ = _763_0
       if not commands[arg[i]] then
         options["ignore-options"] = true
         i = (i + 1)
@@ -6469,25 +6561,25 @@ local function load_initfile()
 end
 local function repl()
   local readline_3f = (("dumb" ~= os.getenv("TERM")) and pcall(require, "readline"))
+  local welcome = {("Welcome to " .. fennel["runtime-version"]() .. "!"), "Use ,help to see available commands."}
   searcher_opts.useMetadata = (false ~= options.useMetadata)
   if (false ~= options.fennelrc) then
     options["fennelrc"] = load_initfile
   end
-  print(("Welcome to " .. fennel["runtime-version"]() .. "!"))
-  print("Use ,help to see available commands.")
   if (not readline_3f and ("dumb" ~= os.getenv("TERM"))) then
-    print("Try installing readline via luarocks for a better repl experience.")
+    table.insert(welcome, ("Try installing readline via luarocks for a " .. "better repl experience."))
   end
+  options.message = table.concat(welcome, "\n")
   return fennel.repl(options)
 end
 local function eval(form)
-  local _761_
+  local _773_
   if (form == "-") then
-    _761_ = (io.stdin):read("*a")
+    _773_ = (io.stdin):read("*a")
   else
-    _761_ = form
+    _773_ = form
   end
-  return print(dosafely(fennel.eval, _761_, options))
+  return print(dosafely(fennel.eval, _773_, options))
 end
 local function compile(files)
   for _, filename in ipairs(files) do
@@ -6499,17 +6591,17 @@ local function compile(files)
       f = assert(io.open(filename, "rb"))
     end
     do
-      local _764_0, _765_0 = nil, nil
-      local function _766_()
+      local _776_0, _777_0 = nil, nil
+      local function _778_()
         return fennel["compile-string"](f:read("*a"), options)
       end
-      _764_0, _765_0 = xpcall(_766_, fennel.traceback)
-      if ((_764_0 == true) and (nil ~= _765_0)) then
-        local val = _765_0
+      _776_0, _777_0 = xpcall(_778_, fennel.traceback)
+      if ((_776_0 == true) and (nil ~= _777_0)) then
+        local val = _777_0
         print(val)
-      elseif (true and (nil ~= _765_0)) then
-        local _0 = _764_0
-        local msg = _765_0
+      elseif (true and (nil ~= _777_0)) then
+        local _0 = _776_0
+        local msg = _777_0
         do end (io.stderr):write((msg .. "\n"))
         os.exit(1)
       end
@@ -6518,57 +6610,56 @@ local function compile(files)
   end
   return nil
 end
-local _768_0 = arg
-local function _769_(...)
+local _780_0 = arg
+local function _781_(...)
   return (0 == #arg)
 end
-if ((_G.type(_768_0) == "table") and _769_(...)) then
+if ((_G.type(_780_0) == "table") and _781_(...)) then
   return repl()
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--repl")) then
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--repl")) then
   return repl()
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--compile")) then
-  local files = {select(2, (table.unpack or _G.unpack)(_768_0))}
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--compile")) then
+  local files = {select(2, (table.unpack or _G.unpack)(_780_0))}
   return compile(files)
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "-c")) then
-  local files = {select(2, (table.unpack or _G.unpack)(_768_0))}
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "-c")) then
+  local files = {select(2, (table.unpack or _G.unpack)(_780_0))}
   return compile(files)
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--compile-binary") and (nil ~= _768_0[2]) and (nil ~= _768_0[3]) and (nil ~= _768_0[4]) and (nil ~= _768_0[5])) then
-  local filename = _768_0[2]
-  local out = _768_0[3]
-  local static_lua = _768_0[4]
-  local lua_include_dir = _768_0[5]
-  local args = {select(6, (table.unpack or _G.unpack)(_768_0))}
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--compile-binary") and (nil ~= _780_0[2]) and (nil ~= _780_0[3]) and (nil ~= _780_0[4]) and (nil ~= _780_0[5])) then
+  local filename = _780_0[2]
+  local out = _780_0[3]
+  local static_lua = _780_0[4]
+  local lua_include_dir = _780_0[5]
+  local args = {select(6, (table.unpack or _G.unpack)(_780_0))}
   local bin = require("fennel.binary")
   options.filename = filename
   options.requireAsInclude = true
   return bin.compile(filename, out, static_lua, lua_include_dir, options, args)
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--compile-binary")) then
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--compile-binary")) then
   local cmd = (arg[0] or "fennel")
   return print((require("fennel.binary").help):format(cmd, cmd, cmd))
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--eval") and (nil ~= _768_0[2])) then
-  local form = _768_0[2]
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--eval") and (nil ~= _780_0[2])) then
+  local form = _780_0[2]
   return eval(form)
-elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "-e") and (nil ~= _768_0[2])) then
-  local form = _768_0[2]
+elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "-e") and (nil ~= _780_0[2])) then
+  local form = _780_0[2]
   return eval(form)
 else
-  local function _797_(...)
-    local a = _768_0[1]
+  local function _811_(...)
+    local a = _780_0[1]
     return ((a == "-v") or (a == "--version"))
   end
-  if (((_G.type(_768_0) == "table") and (nil ~= _768_0[1])) and _797_(...)) then
-    local a = _768_0[1]
+  if (((_G.type(_780_0) == "table") and (nil ~= _780_0[1])) and _811_(...)) then
+    local a = _780_0[1]
     return print(fennel["runtime-version"]())
-  elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "--help")) then
+  elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "--help")) then
     return print(help)
-  elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "-h")) then
+  elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "-h")) then
     return print(help)
-  elseif ((_G.type(_768_0) == "table") and (_768_0[1] == "-")) then
-    local args = {select(2, (table.unpack or _G.unpack)(_768_0))}
+  elseif ((_G.type(_780_0) == "table") and (_780_0[1] == "-")) then
     return dosafely(fennel.eval, (io.stdin):read("*a"))
-  elseif ((_G.type(_768_0) == "table") and (nil ~= _768_0[1])) then
-    local filename = _768_0[1]
-    local args = {select(2, (table.unpack or _G.unpack)(_768_0))}
+  elseif ((_G.type(_780_0) == "table") and (nil ~= _780_0[1])) then
+    local filename = _780_0[1]
+    local args = {select(2, (table.unpack or _G.unpack)(_780_0))}
     arg[-2] = arg[-1]
     arg[-1] = arg[0]
     arg[0] = table.remove(arg, 1)
diff --git a/src/fennel.lua b/src/fennel.lua
index d8d1c2b..0461ff4 100644
--- a/src/fennel.lua
+++ b/src/fennel.lua
@@ -1,3 +1,5 @@
+-- SPDX-License-Identifier: MIT
+-- SPDX-FileCopyrightText: Calvin Rose and contributors
 package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   local utils = require("fennel.utils")
   local parser = require("fennel.parser")
@@ -5,15 +7,16 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   local specials = require("fennel.specials")
   local view = require("fennel.view")
   local unpack = (table.unpack or _G.unpack)
-  local function default_read_chunk(parser_state)
-    local function _607_()
-      if (0 < parser_state["stack-size"]) then
-        return ".."
-      else
-        return ">> "
-      end
+  local depth = 0
+  local function prompt_for(top_3f)
+    if top_3f then
+      return (string.rep(">", (depth + 1)) .. " ")
+    else
+      return (string.rep(".", (depth + 1)) .. " ")
     end
-    io.write(_607_())
+  end
+  local function default_read_chunk(parser_state)
+    io.write(prompt_for((0 == parser_state["stack-size"])))
     io.flush()
     local input = io.read()
     return (input and (input .. "\n"))
@@ -23,18 +26,18 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return io.write("\n")
   end
   local function default_on_error(errtype, err, lua_source)
-    local function _609_()
-      local _608_0 = errtype
-      if (_608_0 == "Lua Compile") then
+    local function _613_()
+      local _612_0 = errtype
+      if (_612_0 == "Lua Compile") then
         return ("Bad code generated - likely a bug with the compiler:\n" .. "--- Generated Lua Start ---\n" .. lua_source .. "--- Generated Lua End ---\n")
-      elseif (_608_0 == "Runtime") then
+      elseif (_612_0 == "Runtime") then
         return (compiler.traceback(tostring(err), 4) .. "\n")
       else
-        local _ = _608_0
+        local _ = _612_0
         return ("%s error: %s\n"):format(errtype, tostring(err))
       end
     end
-    return io.write(_609_())
+    return io.write(_613_())
   end
   local function splice_save_locals(env, lua_source, scope)
     local saves = nil
@@ -42,7 +45,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
       for name in pairs(env.___replLocals___) do
-        local val_19_ = ("local %s = ___replLocals___['%s']"):format((scope.manglings[name] or name), name)
+        local val_19_ = ("local %s = ___replLocals___[%q]"):format((scope.manglings[name] or name), name)
         if (nil ~= val_19_) then
           i_18_ = (i_18_ + 1)
           tbl_17_[i_18_] = val_19_
@@ -57,7 +60,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       for raw, name in pairs(scope.manglings) do
         local val_19_ = nil
         if not scope.gensyms[name] then
-          val_19_ = ("___replLocals___['%s'] = %s"):format(raw, name)
+          val_19_ = ("___replLocals___[%q] = %s"):format(raw, name)
         else
         val_19_ = nil
         end
@@ -74,25 +77,25 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     else
       gap = " "
     end
-    local function _615_()
+    local function _619_()
       if next(saves) then
         return (table.concat(saves, " ") .. gap)
       else
         return ""
       end
     end
-    local function _618_()
-      local _616_0, _617_0 = lua_source:match("^(.*)[\n ](return .*)$")
-      if ((nil ~= _616_0) and (nil ~= _617_0)) then
-        local body = _616_0
-        local _return = _617_0
+    local function _622_()
+      local _620_0, _621_0 = lua_source:match("^(.*)[\n ](return .*)$")
+      if ((nil ~= _620_0) and (nil ~= _621_0)) then
+        local body = _620_0
+        local _return = _621_0
         return (body .. gap .. table.concat(binds, " ") .. gap .. _return)
       else
-        local _ = _616_0
+        local _ = _620_0
         return lua_source
       end
     end
-    return (_615_() .. _618_())
+    return (_619_() .. _622_())
   end
   local function completer(env, scope, text)
     local max_items = 2000
@@ -104,14 +107,14 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       local scope_first_3f = ((tbl == env) or (tbl == env.___replLocals___))
       local tbl_17_ = matches
       local i_18_ = #tbl_17_
-      local function _620_()
+      local function _624_()
         if scope_first_3f then
           return scope.manglings
         else
           return tbl
         end
       end
-      for k, is_mangled in utils.allpairs(_620_()) do
+      for k, is_mangled in utils.allpairs(_624_()) do
         if (max_items <= #matches) then break end
         local val_19_ = nil
         do
@@ -179,7 +182,7 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return input:match("^%s*,")
   end
   local function command_docs()
-    local _629_
+    local _633_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
@@ -190,18 +193,18 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
           tbl_17_[i_18_] = val_19_
         end
       end
-      _629_ = tbl_17_
+      _633_ = tbl_17_
     end
-    return table.concat(_629_, "\n")
+    return table.concat(_633_, "\n")
   end
   commands.help = function(_, _0, on_values)
-    return on_values({("Welcome to Fennel.\nThis is the REPL where you can enter code to be evaluated.\nYou can also run these repl commands:\n\n" .. command_docs() .. "\n  ,exit - Leave the repl.\n\nUse ,doc something to see descriptions for individual macros and special forms.\n\nFor more information about the language, see https://fennel-lang.org/reference")})
+    return on_values({("Welcome to Fennel.\nThis is the REPL where you can enter code to be evaluated.\nYou can also run these repl commands:\n\n" .. command_docs() .. "\n  ,return FORM - Evaluate FORM and return its value to the REPL's caller.\n  ,exit - Leave the repl.\n\nUse ,doc something to see descriptions for individual macros and special forms.\nValues from previous inputs are kept in *1, *2, and *3.\n\nFor more information about the language, see https://fennel-lang.org/reference")})
   end
   do end (compiler.metadata):set(commands.help, "fnl/docstring", "Show this message.")
   local function reload(module_name, env, on_values, on_error)
-    local _631_0, _632_0 = pcall(specials["load-code"]("return require(...)", env), module_name)
-    if ((_631_0 == true) and (nil ~= _632_0)) then
-      local old = _632_0
+    local _635_0, _636_0 = pcall(specials["load-code"]("return require(...)", env), module_name)
+    if ((_635_0 == true) and (nil ~= _636_0)) then
+      local old = _636_0
       local _ = nil
       package.loaded[module_name] = nil
       _ = nil
@@ -226,8 +229,8 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         package.loaded[module_name] = old
       end
       return on_values({"ok"})
-    elseif ((_631_0 == false) and (nil ~= _632_0)) then
-      local msg = _632_0
+    elseif ((_635_0 == false) and (nil ~= _636_0)) then
+      local msg = _636_0
       if msg:match("loop or previous error loading module") then
         package.loaded[module_name] = nil
         return reload(module_name, env, on_values, on_error)
@@ -235,32 +238,32 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         specials["macro-loaded"][module_name] = nil
         return nil
       else
-        local function _637_()
-          local _636_0 = msg:gsub("\n.*", "")
-          return _636_0
+        local function _641_()
+          local _640_0 = msg:gsub("\n.*", "")
+          return _640_0
         end
-        return on_error("Runtime", _637_())
+        return on_error("Runtime", _641_())
       end
     end
   end
   local function run_command(read, on_error, f)
-    local _640_0, _641_0, _642_0 = pcall(read)
-    if ((_640_0 == true) and (_641_0 == true) and (nil ~= _642_0)) then
-      local val = _642_0
-      local _643_0, _644_0 = pcall(f, val)
-      if ((_643_0 == false) and (nil ~= _644_0)) then
-        local msg = _644_0
+    local _644_0, _645_0, _646_0 = pcall(read)
+    if ((_644_0 == true) and (_645_0 == true) and (nil ~= _646_0)) then
+      local val = _646_0
+      local _647_0, _648_0 = pcall(f, val)
+      if ((_647_0 == false) and (nil ~= _648_0)) then
+        local msg = _648_0
         return on_error("Runtime", msg)
       end
-    elseif (_640_0 == false) then
+    elseif (_644_0 == false) then
       return on_error("Parse", "Couldn't parse input.")
     end
   end
   commands.reload = function(env, read, on_values, on_error)
-    local function _647_(_241)
+    local function _651_(_241)
       return reload(tostring(_241), env, on_values, on_error)
     end
-    return run_command(read, on_error, _647_)
+    return run_command(read, on_error, _651_)
   end
   do end (compiler.metadata):set(commands.reload, "fnl/docstring", "Reload the specified module.")
   commands.reset = function(env, _, on_values)
@@ -269,28 +272,28 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   end
   do end (compiler.metadata):set(commands.reset, "fnl/docstring", "Erase all repl-local scope.")
   commands.complete = function(env, read, on_values, on_error, scope, chars)
-    local function _648_()
+    local function _652_()
       return on_values(completer(env, scope, table.concat(chars):gsub(",complete +", ""):sub(1, -2)))
     end
-    return run_command(read, on_error, _648_)
+    return run_command(read, on_error, _652_)
   end
   do end (compiler.metadata):set(commands.complete, "fnl/docstring", "Print all possible completions for a given input symbol.")
   local function apropos_2a(pattern, tbl, prefix, seen, names)
     for name, subtbl in pairs(tbl) do
       if (("string" == type(name)) and (package ~= subtbl)) then
-        local _649_0 = type(subtbl)
-        if (_649_0 == "function") then
+        local _653_0 = type(subtbl)
+        if (_653_0 == "function") then
           if ((prefix .. name)):match(pattern) then
             table.insert(names, (prefix .. name))
           end
-        elseif (_649_0 == "table") then
+        elseif (_653_0 == "table") then
           if not seen[subtbl] then
-            local _651_
+            local _655_
             do
               seen[subtbl] = true
-              _651_ = seen
+              _655_ = seen
             end
-            apropos_2a(pattern, subtbl, (prefix .. name:gsub("%.", "/") .. "."), _651_, names)
+            apropos_2a(pattern, subtbl, (prefix .. name:gsub("%.", "/") .. "."), _655_, names)
           end
         end
       end
@@ -311,10 +314,10 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return tbl_17_
   end
   commands.apropos = function(_env, read, on_values, on_error, _scope)
-    local function _656_(_241)
+    local function _660_(_241)
       return on_values(apropos(tostring(_241)))
     end
-    return run_command(read, on_error, _656_)
+    return run_command(read, on_error, _660_)
   end
   do end (compiler.metadata):set(commands.apropos, "fnl/docstring", "Print all functions matching a pattern in all loaded modules.")
   local function apropos_follow_path(path)
@@ -334,12 +337,12 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     local tgt = package.loaded
     for _, path0 in ipairs(paths) do
       if (nil == tgt) then break end
-      local _659_
+      local _663_
       do
-        local _658_0 = path0:gsub("%/", ".")
-        _659_ = _658_0
+        local _662_0 = path0:gsub("%/", ".")
+        _663_ = _662_0
       end
-      tgt = tgt[_659_]
+      tgt = tgt[_663_]
     end
     return tgt
   end
@@ -351,9 +354,9 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       do
         local tgt = apropos_follow_path(path)
         if ("function" == type(tgt)) then
-          local _660_0 = (compiler.metadata):get(tgt, "fnl/docstring")
-          if (nil ~= _660_0) then
-            local docstr = _660_0
+          local _664_0 = (compiler.metadata):get(tgt, "fnl/docstring")
+          if (nil ~= _664_0) then
+            local docstr = _664_0
             val_19_ = (docstr:match(pattern) and path)
           else
           val_19_ = nil
@@ -370,125 +373,125 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     return tbl_17_
   end
   commands["apropos-doc"] = function(_env, read, on_values, on_error, _scope)
-    local function _664_(_241)
+    local function _668_(_241)
       return on_values(apropos_doc(tostring(_241)))
     end
-    return run_command(read, on_error, _664_)
+    return run_command(read, on_error, _668_)
   end
   do end (compiler.metadata):set(commands["apropos-doc"], "fnl/docstring", "Print all functions that match the pattern in their docs")
   local function apropos_show_docs(on_values, pattern)
     for _, path in ipairs(apropos(pattern)) do
       local tgt = apropos_follow_path(path)
       if (("function" == type(tgt)) and (compiler.metadata):get(tgt, "fnl/docstring")) then
-        on_values(specials.doc(tgt, path))
-        on_values()
+        on_values({specials.doc(tgt, path)})
+        on_values({})
       end
     end
     return nil
   end
   commands["apropos-show-docs"] = function(_env, read, on_values, on_error)
-    local function _666_(_241)
+    local function _670_(_241)
       return apropos_show_docs(on_values, tostring(_241))
     end
-    return run_command(read, on_error, _666_)
+    return run_command(read, on_error, _670_)
   end
   do end (compiler.metadata):set(commands["apropos-show-docs"], "fnl/docstring", "Print all documentations matching a pattern in function name")
-  local function resolve(identifier, _667_0, scope)
-    local _668_ = _667_0
-    local env = _668_
-    local ___replLocals___ = _668_["___replLocals___"]
+  local function resolve(identifier, _671_0, scope)
+    local _672_ = _671_0
+    local env = _672_
+    local ___replLocals___ = _672_["___replLocals___"]
     local e = nil
-    local function _669_(_241, _242)
+    local function _673_(_241, _242)
       return (___replLocals___[scope.unmanglings[_242]] or env[_242])
     end
-    e = setmetatable({}, {__index = _669_})
-    local function _670_(...)
-      local _671_0, _672_0 = ...
-      if ((_671_0 == true) and (nil ~= _672_0)) then
-        local code = _672_0
-        local function _673_(...)
-          local _674_0, _675_0 = ...
-          if ((_674_0 == true) and (nil ~= _675_0)) then
-            local val = _675_0
+    e = setmetatable({}, {__index = _673_})
+    local function _674_(...)
+      local _675_0, _676_0 = ...
+      if ((_675_0 == true) and (nil ~= _676_0)) then
+        local code = _676_0
+        local function _677_(...)
+          local _678_0, _679_0 = ...
+          if ((_678_0 == true) and (nil ~= _679_0)) then
+            local val = _679_0
             return val
           else
-            local _ = _674_0
+            local _ = _678_0
             return nil
           end
         end
-        return _673_(pcall(specials["load-code"](code, e)))
+        return _677_(pcall(specials["load-code"](code, e)))
       else
-        local _ = _671_0
+        local _ = _675_0
         return nil
       end
     end
-    return _670_(pcall(compiler["compile-string"], tostring(identifier), {scope = scope}))
+    return _674_(pcall(compiler["compile-string"], tostring(identifier), {scope = scope}))
   end
   commands.find = function(env, read, on_values, on_error, scope)
-    local function _678_(_241)
-      local _679_0 = nil
+    local function _682_(_241)
+      local _683_0 = nil
       do
-        local _680_0 = utils["sym?"](_241)
-        if (nil ~= _680_0) then
-          local _681_0 = resolve(_680_0, env, scope)
-          if (nil ~= _681_0) then
-            _679_0 = debug.getinfo(_681_0)
+        local _684_0 = utils["sym?"](_241)
+        if (nil ~= _684_0) then
+          local _685_0 = resolve(_684_0, env, scope)
+          if (nil ~= _685_0) then
+            _683_0 = debug.getinfo(_685_0)
           else
-            _679_0 = _681_0
+            _683_0 = _685_0
           end
         else
-          _679_0 = _680_0
+          _683_0 = _684_0
         end
       end
-      if ((_G.type(_679_0) == "table") and (nil ~= _679_0.linedefined) and (nil ~= _679_0.short_src) and (nil ~= _679_0.source) and (_679_0.what == "Lua")) then
-        local line = _679_0.linedefined
-        local src = _679_0.short_src
-        local source = _679_0.source
+      if ((_G.type(_683_0) == "table") and (nil ~= _683_0.linedefined) and (nil ~= _683_0.short_src) and (nil ~= _683_0.source) and (_683_0.what == "Lua")) then
+        local line = _683_0.linedefined
+        local src = _683_0.short_src
+        local source = _683_0.source
         local fnlsrc = nil
         do
-          local _684_0 = compiler.sourcemap
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[source]
+          local _688_0 = compiler.sourcemap
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[source]
           end
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[line]
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[line]
           end
-          if (nil ~= _684_0) then
-            _684_0 = _684_0[2]
+          if (nil ~= _688_0) then
+            _688_0 = _688_0[2]
           end
-          fnlsrc = _684_0
+          fnlsrc = _688_0
         end
         return on_values({string.format("%s:%s", src, (fnlsrc or line))})
-      elseif (_679_0 == nil) then
+      elseif (_683_0 == nil) then
         return on_error("Repl", "Unknown value")
       else
-        local _ = _679_0
+        local _ = _683_0
         return on_error("Repl", "No source info")
       end
     end
-    return run_command(read, on_error, _678_)
+    return run_command(read, on_error, _682_)
   end
   do end (compiler.metadata):set(commands.find, "fnl/docstring", "Print the filename and line number for a given function")
   commands.doc = function(env, read, on_values, on_error, scope)
-    local function _689_(_241)
+    local function _693_(_241)
       local name = tostring(_241)
       local path = (utils["multi-sym?"](name) or {name})
       local ok_3f, target = nil, nil
-      local function _690_()
+      local function _694_()
         return (utils["get-in"](scope.specials, path) or utils["get-in"](scope.macros, path) or resolve(name, env, scope))
       end
-      ok_3f, target = pcall(_690_)
+      ok_3f, target = pcall(_694_)
       if ok_3f then
         return on_values({specials.doc(target, name)})
       else
         return on_error("Repl", ("Could not find " .. name .. " for docs."))
       end
     end
-    return run_command(read, on_error, _689_)
+    return run_command(read, on_error, _693_)
   end
   do end (compiler.metadata):set(commands.doc, "fnl/docstring", "Print the docstring and arglist for a function, macro, or special form.")
   commands.compile = function(env, read, on_values, on_error, scope)
-    local function _692_(_241)
+    local function _696_(_241)
       local allowedGlobals = specials["current-global-names"](env)
       local ok_3f, result = pcall(compiler.compile, _241, {allowedGlobals = allowedGlobals, env = env, scope = scope})
       if ok_3f then
@@ -497,15 +500,15 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         return on_error("Repl", ("Error compiling expression: " .. result))
       end
     end
-    return run_command(read, on_error, _692_)
+    return run_command(read, on_error, _696_)
   end
   do end (compiler.metadata):set(commands.compile, "fnl/docstring", "compiles the expression into lua and prints the result.")
   local function load_plugin_commands(plugins)
     for i = #(plugins or {}), 1, -1 do
       for name, f in pairs(plugins[i]) do
-        local _694_0 = name:match("^repl%-command%-(.*)")
-        if (nil ~= _694_0) then
-          local cmd_name = _694_0
+        local _698_0 = name:match("^repl%-command%-(.*)")
+        if (nil ~= _698_0) then
+          local cmd_name = _698_0
           commands[cmd_name] = f
         end
       end
@@ -515,19 +518,19 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   local function run_command_loop(input, read, loop, env, on_values, on_error, scope, chars)
     local command_name = input:match(",([^%s/]+)")
     do
-      local _696_0 = commands[command_name]
-      if (nil ~= _696_0) then
-        local command = _696_0
+      local _700_0 = commands[command_name]
+      if (nil ~= _700_0) then
+        local command = _700_0
         command(env, read, on_values, on_error, scope, chars)
       else
-        local _ = _696_0
-        if ("exit" ~= command_name) then
+        local _ = _700_0
+        if ((command_name ~= "exit") and (command_name ~= "return")) then
           on_values({"Unknown command", command_name})
         end
       end
     end
     if ("exit" ~= command_name) then
-      return loop()
+      return loop((command_name == "return"))
     end
   end
   local function try_readline_21(opts, ok, readline)
@@ -570,9 +573,9 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
   end
   local function repl(_3foptions)
     local old_root_options = utils.root.options
-    local _705_ = utils.copy(_3foptions)
-    local opts = _705_
-    local _3ffennelrc = _705_["fennelrc"]
+    local _709_ = utils.copy(_3foptions)
+    local opts = _709_
+    local _3ffennelrc = _709_["fennelrc"]
     local _ = nil
     opts.fennelrc = nil
     _ = nil
@@ -587,35 +590,42 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
     local callbacks = {env = env, onError = (opts.onError or default_on_error), onValues = (opts.onValues or default_on_values), pp = (opts.pp or view), readChunk = (opts.readChunk or default_read_chunk)}
     local save_locals_3f = (opts.saveLocals ~= false)
     local byte_stream, clear_stream = nil, nil
-    local function _707_(_241)
+    local function _711_(_241)
       return callbacks.readChunk(_241)
     end
-    byte_stream, clear_stream = parser.granulate(_707_)
+    byte_stream, clear_stream = parser.granulate(_711_)
     local chars = {}
     local read, reset = nil, nil
-    local function _708_(parser_state)
+    local function _712_(parser_state)
       local b = byte_stream(parser_state)
       if b then
         table.insert(chars, string.char(b))
       end
       return b
     end
-    read, reset = parser.parser(_708_)
+    read, reset = parser.parser(_712_)
+    depth = (depth + 1)
+    if opts.message then
+      callbacks.onValues({opts.message})
+    end
     env.___repl___ = callbacks
     opts.env, opts.scope = env, compiler["make-scope"]()
     opts.useMetadata = (opts.useMetadata ~= false)
     if (opts.allowedGlobals == nil) then
       opts.allowedGlobals = specials["current-global-names"](env)
     end
+    if opts.init then
+      opts.init(opts, depth)
+    end
     if opts.registerCompleter then
-      local function _712_()
-        local _711_0 = opts.scope
-        local function _713_(...)
-          return completer(env, _711_0, ...)
+      local function _718_()
+        local _717_0 = opts.scope
+        local function _719_(...)
+          return completer(env, _717_0, ...)
         end
-        return _713_
+        return _719_
       end
-      opts.registerCompleter(_712_())
+      opts.registerCompleter(_718_())
     end
     load_plugin_commands(opts.plugins)
     if save_locals_3f then
@@ -636,12 +646,21 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
       end
       return callbacks.onValues(out)
     end
-    local function loop()
+    local function save_value(...)
+      env.___replLocals___["*3"] = env.___replLocals___["*2"]
+      env.___replLocals___["*2"] = env.___replLocals___["*1"]
+      env.___replLocals___["*1"] = ...
+      return ...
+    end
+    opts.scope.manglings["*1"], opts.scope.unmanglings._1 = "_1", "*1"
+    opts.scope.manglings["*2"], opts.scope.unmanglings._2 = "_2", "*2"
+    opts.scope.manglings["*3"], opts.scope.unmanglings._3 = "_3", "*3"
+    local function loop(exit_next_3f)
       for k in pairs(chars) do
         chars[k] = nil
       end
       reset()
-      local ok, parser_not_eof_3f, x = pcall(read)
+      local ok, parser_not_eof_3f, form = pcall(read)
       local src_string = table.concat(chars)
       local readline_not_eof_3f = (not readline or (src_string ~= "(null)"))
       local not_eof_3f = (readline_not_eof_3f and parser_not_eof_3f)
@@ -653,52 +672,66 @@ package.preload["fennel.repl"] = package.preload["fennel.repl"] or function(...)
         return run_command_loop(src_string, read, loop, env, callbacks.onValues, callbacks.onError, opts.scope, chars)
       else
         if not_eof_3f then
-          do
-            local _717_0, _718_0 = nil, nil
-            local function _719_()
-              opts["source"] = src_string
-              return opts
-            end
-            _717_0, _718_0 = pcall(compiler.compile, x, _719_())
-            if ((_717_0 == false) and (nil ~= _718_0)) then
-              local msg = _718_0
+          local function _723_(...)
+            local _724_0, _725_0 = ...
+            if ((_724_0 == true) and (nil ~= _725_0)) then
+              local src = _725_0
+              local function _726_(...)
+                local _727_0, _728_0 = ...
+                if ((_727_0 == true) and (nil ~= _728_0)) then
+                  local chunk = _728_0
+                  local function _729_()
+                    return print_values(save_value(chunk()))
+                  end
+                  local function _730_(...)
+                    return callbacks.onError("Runtime", ...)
+                  end
+                  return xpcall(_729_, _730_)
+                elseif ((_727_0 == false) and (nil ~= _728_0)) then
+                  local msg = _728_0
+                  clear_stream()
+                  return callbacks.onError("Compile", msg)
+                end
+              end
+              local function _733_(...)
+                local src0 = nil
+                if save_locals_3f then
+                  src0 = splice_save_locals(env, src, opts.scope)
+                else
+                  src0 = src
+                end
+                return pcall(specials["load-code"], src0, env)
+              end
+              return _726_(_733_(...))
+            elseif ((_724_0 == false) and (nil ~= _725_0)) then
+              local msg = _725_0
               clear_stream()
-              callbacks.onError("Compile", msg)
-            elseif ((_717_0 == true) and (nil ~= _718_0)) then
-              local src = _718_0
-              local src0 = nil
-              if save_locals_3f then
-                src0 = splice_save_locals(env, src, opts.scope)
-              else
-                src0 = src
-              end
-              local _721_0, _722_0 = pcall(specials["load-code"], src0, env)
-              if ((_721_0 == false) and (nil ~= _722_0)) then
-                local msg = _722_0
-                clear_stream()
-                callbacks.onError("Lua Compile", msg, src0)
-              elseif (true and (nil ~= _722_0)) then
-                local _1 = _721_0
-                local chunk = _722_0
-                local function _723_()
-                  return print_values(chunk())
-                end
-                local function _724_(...)
-                  return callbacks.onError("Runtime", ...)
-                end
-                xpcall(_723_, _724_)
-              end
+              return callbacks.onError("Compile", msg)
             end
           end
+          local function _735_()
+            opts["source"] = src_string
+            return opts
+          end
+          _723_(pcall(compiler.compile, form, _735_()))
           utils.root.options = old_root_options
-          return loop()
+          if exit_next_3f then
+            return env.___replLocals___["*1"]
+          else
+            return loop()
+          end
         end
       end
     end
-    loop()
+    local value = loop()
+    depth = (depth - 1)
     if readline then
-      return readline.save_history()
+      readline.save_history()
     end
+    if opts.exit then
+      opts.exit(opts, depth)
+    end
+    return value
   end
   return repl
 end
@@ -710,14 +743,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local unpack = (table.unpack or _G.unpack)
   local SPECIALS = compiler.scopes.global.specials
   local function wrap_env(env)
-    local function _416_(_, key)
+    local function _418_(_, key)
       if utils["string?"](key) then
         return env[compiler["global-unmangling"](key)]
       else
         return env[key]
       end
     end
-    local function _418_(_, key, value)
+    local function _420_(_, key, value)
       if utils["string?"](key) then
         env[compiler["global-unmangling"](key)] = value
         return nil
@@ -726,26 +759,26 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         return nil
       end
     end
-    local function _420_()
+    local function _422_()
       local function putenv(k, v)
-        local _421_
+        local _423_
         if utils["string?"](k) then
-          _421_ = compiler["global-unmangling"](k)
+          _423_ = compiler["global-unmangling"](k)
         else
-          _421_ = k
+          _423_ = k
         end
-        return _421_, v
+        return _423_, v
       end
       return next, utils.kvmap(env, putenv), nil
     end
-    return setmetatable({}, {__index = _416_, __newindex = _418_, __pairs = _420_})
+    return setmetatable({}, {__index = _418_, __newindex = _420_, __pairs = _422_})
   end
   local function current_global_names(_3fenv)
     local mt = nil
     do
-      local _423_0 = getmetatable(_3fenv)
-      if ((_G.type(_423_0) == "table") and (nil ~= _423_0.__pairs)) then
-        local mtpairs = _423_0.__pairs
+      local _425_0 = getmetatable(_3fenv)
+      if ((_G.type(_425_0) == "table") and (nil ~= _425_0.__pairs)) then
+        local mtpairs = _425_0.__pairs
         local tbl_14_ = {}
         for k, v in mtpairs(_3fenv) do
           local k_15_, v_16_ = k, v
@@ -754,7 +787,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           end
         end
         mt = tbl_14_
-      elseif (_423_0 == nil) then
+      elseif (_425_0 == nil) then
         mt = (_3fenv or _G)
       else
       mt = nil
@@ -764,15 +797,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function load_code(code, _3fenv, _3ffilename)
     local env = (_3fenv or rawget(_G, "_ENV") or _G)
-    local _426_0, _427_0 = rawget(_G, "setfenv"), rawget(_G, "loadstring")
-    if ((nil ~= _426_0) and (nil ~= _427_0)) then
-      local setfenv = _426_0
-      local loadstring = _427_0
+    local _428_0, _429_0 = rawget(_G, "setfenv"), rawget(_G, "loadstring")
+    if ((nil ~= _428_0) and (nil ~= _429_0)) then
+      local setfenv = _428_0
+      local loadstring = _429_0
       local f = assert(loadstring(code, _3ffilename))
       setfenv(f, env)
       return f
     else
-      local _ = _426_0
+      local _ = _428_0
       return assert(load(code, _3ffilename, "t", env))
     end
   end
@@ -784,13 +817,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       local mt = getmetatable(tgt)
       if ((type(tgt) == "function") or ((type(mt) == "table") and (type(mt.__call) == "function"))) then
         local arglist = table.concat(((compiler.metadata):get(tgt, "fnl/arglist") or {"#<unknown-arguments>"}), " ")
-        local _429_
+        local _431_
         if (0 < #arglist) then
-          _429_ = " "
+          _431_ = " "
         else
-          _429_ = ""
+          _431_ = ""
         end
-        return string.format("(%s%s%s)\n  %s", name, _429_, arglist, docstring)
+        return string.format("(%s%s%s)\n  %s", name, _431_, arglist, docstring)
       else
         return string.format("%s\n  %s", name, docstring)
       end
@@ -817,16 +850,12 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local retexprs = {returned = true}
     utils.hook("customhook-early-do", ast, sub_scope)
     local function compile_body(outer_target, outer_tail, outer_retexprs)
-      if (len < start) then
-        compiler.compile1(nil, sub_scope, chunk, {tail = outer_tail, target = outer_target})
-      else
-        for i = start, len do
-          local subopts = {nval = (((i ~= len) and 0) or opts.nval), tail = (((i == len) and outer_tail) or nil), target = (((i == len) and outer_target) or nil)}
-          local _ = utils["propagate-options"](opts, subopts)
-          local subexprs = compiler.compile1(ast[i], sub_scope, chunk, subopts)
-          if (i ~= len) then
-            compiler["keep-side-effects"](subexprs, parent, nil, ast[i])
-          end
+      for i = start, len do
+        local subopts = {nval = (((i ~= len) and 0) or opts.nval), tail = (((i == len) and outer_tail) or nil), target = (((i == len) and outer_target) or nil)}
+        local _ = utils["propagate-options"](opts, subopts)
+        local subexprs = compiler.compile1(ast[i], sub_scope, chunk, subopts)
+        if (i ~= len) then
+          compiler["keep-side-effects"](subexprs, parent, nil, ast[i])
         end
       end
       compiler.emit(parent, chunk, ast)
@@ -904,9 +933,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local opts = {nval = 1, tail = false}
     local scope = compiler["make-scope"]()
     local chunk = {}
-    local _440_ = compiler.compile1(v, scope, chunk, opts)
-    local _441_ = _440_[1]
-    local v0 = _441_[1]
+    local _441_ = compiler.compile1(v, scope, chunk, opts)
+    local _442_ = _441_[1]
+    local v0 = _442_[1]
     return v0
   end
   local function insert_meta(meta, k, v)
@@ -914,23 +943,23 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((type(k) == "string"), ("expected string keys in metadata table, got: %s"):format(view(k, view_opts)))
     compiler.assert(literal_3f(v), ("expected literal value in metadata table, got: %s %s"):format(view(k, view_opts), view(v, view_opts)))
     table.insert(meta, view(k))
-    local function _442_()
+    local function _443_()
       if ("string" == type(v)) then
         return view(v, view_opts)
       else
         return compile_value(v)
       end
     end
-    table.insert(meta, _442_())
+    table.insert(meta, _443_())
     return meta
   end
   local function insert_arglist(meta, arg_list)
     local view_opts = {["escape-newlines?"] = true, ["line-length"] = math.huge, ["one-line?"] = true}
     table.insert(meta, "\"fnl/arglist\"")
-    local function _443_(_241)
+    local function _444_(_241)
       return view(view(_241, view_opts))
     end
-    table.insert(meta, ("{" .. table.concat(utils.map(arg_list, _443_), ", ") .. "}"))
+    table.insert(meta, ("{" .. table.concat(utils.map(arg_list, _444_), ", ") .. "}"))
     return meta
   end
   local function set_fn_metadata(f_metadata, parent, fn_name)
@@ -949,13 +978,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function get_fn_name(ast, scope, fn_name, multi)
     if (fn_name and (fn_name[1] ~= "nil")) then
-      local _446_
+      local _447_
       if not multi then
-        _446_ = compiler["declare-local"](fn_name, {}, scope, ast)
+        _447_ = compiler["declare-local"](fn_name, {}, scope, ast)
       else
-        _446_ = compiler["symbol-to-expression"](fn_name, scope)[1]
+        _447_ = compiler["symbol-to-expression"](fn_name, scope)[1]
       end
-      return _446_, not multi, 3
+      return _447_, not multi, 3
     else
       return nil, true, 2
     end
@@ -965,13 +994,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     for i = (index + 1), #ast do
       compiler.compile1(ast[i], f_scope, f_chunk, {nval = (((i ~= #ast) and 0) or nil), tail = (i == #ast)})
     end
-    local _449_
+    local _450_
     if local_3f then
-      _449_ = "local function %s(%s)"
+      _450_ = "local function %s(%s)"
     else
-      _449_ = "%s = function(%s)"
+      _450_ = "%s = function(%s)"
     end
-    compiler.emit(parent, string.format(_449_, fn_name, table.concat(arg_name_list, ", ")), ast)
+    compiler.emit(parent, string.format(_450_, fn_name, table.concat(arg_name_list, ", ")), ast)
     compiler.emit(parent, f_chunk, ast)
     compiler.emit(parent, "end", ast)
     set_fn_metadata(f_metadata, parent, fn_name)
@@ -993,7 +1022,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function get_function_metadata(ast, arg_list, index)
-    local function _452_(_241, _242)
+    local function _453_(_241, _242)
       local tbl_14_ = _241
       for k, v in pairs(_242) do
         local k_15_, v_16_ = k, v
@@ -1003,18 +1032,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       end
       return tbl_14_
     end
-    local function _454_(_241, _242)
+    local function _455_(_241, _242)
       _241["fnl/docstring"] = _242
       return _241
     end
-    return maybe_metadata(ast, utils["kv-table?"], _452_, maybe_metadata(ast, utils["string?"], _454_, {["fnl/arglist"] = arg_list}, index))
+    return maybe_metadata(ast, utils["kv-table?"], _453_, maybe_metadata(ast, utils["string?"], _455_, {["fnl/arglist"] = arg_list}, index))
   end
   SPECIALS.fn = function(ast, scope, parent)
     local f_scope = nil
     do
-      local _455_0 = compiler["make-scope"](scope)
-      _455_0["vararg"] = false
-      f_scope = _455_0
+      local _456_0 = compiler["make-scope"](scope)
+      _456_0["vararg"] = false
+      f_scope = _456_0
     end
     local f_chunk = {}
     local fn_sym = utils["sym?"](ast[2])
@@ -1074,36 +1103,36 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special("fn", {"name?", "args", "docstring?", "..."}, "Function syntax. May optionally include a name and docstring or a metadata table.\nIf a name is provided, the function will be bound in the current scope.\nWhen called with the wrong number of args, excess args will be discarded\nand lacking args will be nil, use lambda for arity-checked functions.", true)
   SPECIALS.lua = function(ast, _, parent)
     compiler.assert(((#ast == 2) or (#ast == 3)), "expected 1 or 2 arguments", ast)
-    local _460_
+    local _461_
     do
-      local _459_0 = utils["sym?"](ast[2])
-      if (nil ~= _459_0) then
-        _460_ = tostring(_459_0)
+      local _460_0 = utils["sym?"](ast[2])
+      if (nil ~= _460_0) then
+        _461_ = tostring(_460_0)
       else
-        _460_ = _459_0
+        _461_ = _460_0
       end
     end
-    if ("nil" ~= _460_) then
+    if ("nil" ~= _461_) then
       table.insert(parent, {ast = ast, leaf = tostring(ast[2])})
     end
-    local _464_
+    local _465_
     do
-      local _463_0 = utils["sym?"](ast[3])
-      if (nil ~= _463_0) then
-        _464_ = tostring(_463_0)
+      local _464_0 = utils["sym?"](ast[3])
+      if (nil ~= _464_0) then
+        _465_ = tostring(_464_0)
       else
-        _464_ = _463_0
+        _465_ = _464_0
       end
     end
-    if ("nil" ~= _464_) then
+    if ("nil" ~= _465_) then
       return tostring(ast[3])
     end
   end
   local function dot(ast, scope, parent)
     compiler.assert((1 < #ast), "expected table argument", ast)
     local len = #ast
-    local _467_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local lhs = _467_[1]
+    local _468_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local lhs = _468_[1]
     if (len == 2) then
       return tostring(lhs)
     else
@@ -1113,8 +1142,8 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         if (utils["string?"](index) and utils["valid-lua-identifier?"](index)) then
           table.insert(indices, ("." .. index))
         else
-          local _468_ = compiler.compile1(index, scope, parent, {nval = 1})
-          local index0 = _468_[1]
+          local _469_ = compiler.compile1(index, scope, parent, {nval = 1})
+          local index0 = _469_[1]
           table.insert(indices, ("[" .. tostring(index0) .. "]"))
         end
       end
@@ -1159,7 +1188,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   doc_special("var", {"name", "val"}, "Introduce new mutable local.")
   local function kv_3f(t)
-    local _472_
+    local _473_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
@@ -1175,9 +1204,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           tbl_17_[i_18_] = val_19_
         end
       end
-      _472_ = tbl_17_
+      _473_ = tbl_17_
     end
-    return _472_[1]
+    return _473_[1]
   end
   SPECIALS.let = function(ast, scope, parent, opts)
     local bindings = ast[2]
@@ -1204,22 +1233,22 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function disambiguate_3f(rootstr, parent)
-    local function _477_()
-      local _476_0 = get_prev_line(parent)
-      if (nil ~= _476_0) then
-        local prev_line = _476_0
+    local function _478_()
+      local _477_0 = get_prev_line(parent)
+      if (nil ~= _477_0) then
+        local prev_line = _477_0
         return prev_line:match("%)$")
       end
     end
-    return (rootstr:match("^{") or rootstr:match("^%(") or _477_())
+    return (rootstr:match("^{") or rootstr:match("^%(") or _478_())
   end
   SPECIALS.tset = function(ast, scope, parent)
     compiler.assert((3 < #ast), "expected table, key, and value arguments", ast)
     local root = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
     local keys = {}
     for i = 3, (#ast - 1) do
-      local _479_ = compiler.compile1(ast[i], scope, parent, {nval = 1})
-      local key = _479_[1]
+      local _480_ = compiler.compile1(ast[i], scope, parent, {nval = 1})
+      local key = _480_[1]
       table.insert(keys, tostring(key))
     end
     local value = compiler.compile1(ast[#ast], scope, parent, {nval = 1})[1]
@@ -1233,7 +1262,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     return compiler.emit(parent, fmtstr:format(rootstr, table.concat(keys, "]["), tostring(value)), ast)
   end
   doc_special("tset", {"tbl", "key1", "...", "keyN", "val"}, "Set the value of a table field. Can take additional keys to set\nnested values, but all parents must contain an existing table.")
-  local function calculate_target(scope, opts)
+  local function calculate_if_target(scope, opts)
     if not (opts.tail or opts.target or opts.nval) then
       return "iife", true, nil
     elseif (opts.nval and (opts.nval ~= 0) and not opts.target) then
@@ -1262,7 +1291,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     else
       local do_scope = compiler["make-scope"](scope)
       local branches = {}
-      local wrapper, inner_tail, inner_target, target_exprs = calculate_target(scope, opts)
+      local wrapper, inner_tail, inner_target, target_exprs = calculate_if_target(scope, opts)
       local body_opts = {nval = opts.nval, tail = inner_tail, target = inner_target}
       local function compile_body(i)
         local chunk = {}
@@ -1346,15 +1375,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function compile_until(condition, scope, chunk)
     if condition then
-      local _490_ = compiler.compile1(condition, scope, chunk, {nval = 1})
-      local condition_lua = _490_[1]
+      local _491_ = compiler.compile1(condition, scope, chunk, {nval = 1})
+      local condition_lua = _491_[1]
       return compiler.emit(chunk, ("if %s then break end"):format(tostring(condition_lua)), utils.expr(condition, "expression"))
     end
   end
   SPECIALS.each = function(ast, scope, parent)
     compiler.assert((3 <= #ast), "expected body expression", ast[1])
     compiler.assert(utils["table?"](ast[2]), "expected binding table", ast)
-    compiler.assert((2 <= #ast[2]), "expected binding and iterator", ast)
     local binding = setmetatable(utils.copy(ast[2]), getmetatable(ast[2]))
     local until_condition = remove_until_condition(binding)
     local iter = table.remove(binding, #binding)
@@ -1376,6 +1404,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local vals = compiler.compile1(iter, scope, parent)
     local val_names = utils.map(vals, tostring)
     local chunk = {}
+    compiler.assert(bind_vars[1], "expected binding and iterator", ast)
     compiler.emit(parent, ("for %s in %s do"):format(table.concat(bind_vars, ", "), table.concat(val_names, ", ")), ast)
     for raw, args in utils.stablepairs(destructures) do
       compiler.destructure(args, raw, ast, sub_scope, chunk, {declaration = true, nomulti = true, symtype = "each"})
@@ -1433,10 +1462,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   SPECIALS["for"] = for_2a
   doc_special("for", {"[index start stop step?]", "..."}, "Numeric loop construct.\nEvaluates body once for each value between start and stop (inclusive).", true)
   local function native_method_call(ast, _scope, _parent, target, args)
-    local _494_ = ast
-    local _ = _494_[1]
-    local _0 = _494_[2]
-    local method_string = _494_[3]
+    local _495_ = ast
+    local _ = _495_[1]
+    local _0 = _495_[2]
+    local method_string = _495_[3]
     local call_string = nil
     if ((target.type == "literal") or (target.type == "varg") or (target.type == "expression")) then
       call_string = "(%s):%s(%s)"
@@ -1458,18 +1487,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local function method_call(ast, scope, parent)
     compiler.assert((2 < #ast), "expected at least 2 arguments", ast)
-    local _496_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local target = _496_[1]
+    local _497_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local target = _497_[1]
     local args = {}
     for i = 4, #ast do
       local subexprs = nil
-      local _497_
+      local _498_
       if (i ~= #ast) then
-        _497_ = 1
+        _498_ = 1
       else
-      _497_ = nil
+      _498_ = nil
       end
-      subexprs = compiler.compile1(ast[i], scope, parent, {nval = _497_})
+      subexprs = compiler.compile1(ast[i], scope, parent, {nval = _498_})
       utils.map(subexprs, tostring, args)
     end
     if (utils["string?"](ast[3]) and utils["valid-lua-identifier?"](ast[3])) then
@@ -1484,14 +1513,14 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special(":", {"tbl", "method-name", "..."}, "Call the named method on tbl with the provided args.\nMethod name doesn't have to be known at compile-time; if it is, use\n(tbl:method-name ...) instead.")
   SPECIALS.comment = function(ast, _, parent)
     local c = nil
-    local _500_
+    local _501_
     do
       local tbl_17_ = {}
       local i_18_ = #tbl_17_
       for i, elt in ipairs(ast) do
         local val_19_ = nil
         if (i ~= 1) then
-          val_19_ = view(ast[i], {["one-line?"] = true})
+          val_19_ = view(elt, {["one-line?"] = true})
         else
         val_19_ = nil
         end
@@ -1500,9 +1529,9 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           tbl_17_[i_18_] = val_19_
         end
       end
-      _500_ = tbl_17_
+      _501_ = tbl_17_
     end
-    c = table.concat(_500_, " "):gsub("%]%]", "]\\]")
+    c = table.concat(_501_, " "):gsub("%]%]", "]\\]")
     return compiler.emit(parent, ("--[[ " .. c .. " ]]"), ast)
   end
   doc_special("comment", {"..."}, "Comment which will be emitted in Lua output.", true)
@@ -1523,10 +1552,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "expected one argument", ast)
     local f_scope = nil
     do
-      local _505_0 = compiler["make-scope"](scope)
-      _505_0["vararg"] = false
-      _505_0["hashfn"] = true
-      f_scope = _505_0
+      local _506_0 = compiler["make-scope"](scope)
+      _506_0["vararg"] = false
+      _506_0["hashfn"] = true
+      f_scope = _506_0
     end
     local f_chunk = {}
     local name = compiler.gensym(scope)
@@ -1567,17 +1596,17 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     return utils.expr(name, "sym")
   end
   doc_special("hashfn", {"..."}, "Function literal shorthand; args are either $... OR $1, $2, etc.")
-  local function maybe_short_circuit_protect(ast, i, name, _510_0)
-    local _511_ = _510_0
-    local mac = _511_["macros"]
+  local function maybe_short_circuit_protect(ast, i, name, _511_0)
+    local _512_ = _511_0
+    local mac = _512_["macros"]
     local call = (utils["list?"](ast) and tostring(ast[1]))
     if ((("or" == name) or ("and" == name)) and (1 < i) and (mac[call] or ("set" == call) or ("tset" == call) or ("global" == call))) then
-      return utils.list(utils.sym("do"), ast)
+      return utils.list(utils.list(utils.sym("fn"), utils.sequence(utils.varg()), ast))
     else
       return ast
     end
   end
-  local function arithmetic_special(name, zero_arity, unary_prefix, ast, scope, parent)
+  local function operator_special(name, zero_arity, unary_prefix, ast, scope, parent)
     local len = #ast
     local operands = {}
     local padded_op = (" " .. name .. " ")
@@ -1590,15 +1619,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         table.insert(operands, tostring(subexprs[1]))
       end
     end
-    local _514_0 = #operands
-    if (_514_0 == 0) then
-      local _515_
+    local _515_0 = #operands
+    if (_515_0 == 0) then
+      local _516_
       do
         compiler.assert(zero_arity, "Expected more than 0 arguments", ast)
-        _515_ = zero_arity
+        _516_ = zero_arity
       end
-      return utils.expr(_515_, "literal")
-    elseif (_514_0 == 1) then
+      return utils.expr(_516_, "literal")
+    elseif (_515_0 == 1) then
       if utils["varg?"](ast[2]) then
         return compiler.assert(false, "tried to use vararg with operator", ast)
       elseif unary_prefix then
@@ -1607,20 +1636,20 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
         return operands[1]
       end
     else
-      local _ = _514_0
+      local _ = _515_0
       return ("(" .. table.concat(operands, padded_op) .. ")")
     end
   end
   local function define_arithmetic_special(name, zero_arity, unary_prefix, _3flua_name)
-    local _519_
+    local _520_
     do
-      local _518_0 = (_3flua_name or name)
-      local function _520_(...)
-        return arithmetic_special(_518_0, zero_arity, unary_prefix, ...)
+      local _519_0 = (_3flua_name or name)
+      local function _521_(...)
+        return operator_special(_519_0, zero_arity, unary_prefix, ...)
       end
-      _519_ = _520_
+      _520_ = _521_
     end
-    SPECIALS[name] = _519_
+    SPECIALS[name] = _520_
     return doc_special(name, {"a", "b", "..."}, "Arithmetic operator; works the same as Lua but accepts more arguments.")
   end
   define_arithmetic_special("+", "0")
@@ -1632,10 +1661,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   define_arithmetic_special("/", nil, "1")
   define_arithmetic_special("//", nil, "1")
   SPECIALS["or"] = function(ast, scope, parent)
-    return arithmetic_special("or", "false", nil, ast, scope, parent)
+    return operator_special("or", "false", nil, ast, scope, parent)
   end
   SPECIALS["and"] = function(ast, scope, parent)
-    return arithmetic_special("and", "true", nil, ast, scope, parent)
+    return operator_special("and", "true", nil, ast, scope, parent)
   end
   doc_special("and", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
   doc_special("or", {"a", "b", "..."}, "Boolean operator; works the same as Lua but accepts more arguments.")
@@ -1649,13 +1678,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       local prefixed_lib_name = ("bit." .. lib_name)
       for i = 2, len do
         local subexprs = nil
-        local _521_
+        local _522_
         if (i ~= len) then
-          _521_ = 1
+          _522_ = 1
         else
-        _521_ = nil
+        _522_ = nil
         end
-        subexprs = compiler.compile1(ast[i], scope, parent, {nval = _521_})
+        subexprs = compiler.compile1(ast[i], scope, parent, {nval = _522_})
         utils.map(subexprs, tostring, operands)
       end
       if (#operands == 1) then
@@ -1674,10 +1703,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
   end
   local function define_bitop_special(name, zero_arity, unary_prefix, native)
-    local function _527_(...)
+    local function _528_(...)
       return bitop_special(native, name, zero_arity, unary_prefix, ...)
     end
-    SPECIALS[name] = _527_
+    SPECIALS[name] = _528_
     return nil
   end
   define_bitop_special("lshift", nil, "1", "<<")
@@ -1692,8 +1721,8 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   doc_special("bxor", {"x1", "x2", "..."}, "Bitwise XOR of any number of arguments.\nOnly works in Lua 5.3+ or LuaJIT with the --use-bit-lib flag.")
   SPECIALS.bnot = function(ast, scope, parent)
     compiler.assert((#ast == 2), "expected one argument", ast)
-    local _528_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
-    local value = _528_[1]
+    local _529_ = compiler.compile1(ast[2], scope, parent, {nval = 1})
+    local value = _529_[1]
     if utils.root.options.useBitLib then
       return ("bit.bnot(" .. tostring(value) .. ")")
     else
@@ -1702,15 +1731,15 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   doc_special("bnot", {"x"}, "Bitwise negation; only works in Lua 5.3+ or LuaJIT with the --use-bit-lib flag.")
   doc_special("..", {"a", "b", "..."}, "String concatenation operator; works the same as Lua but accepts more arguments.")
-  local function native_comparator(op, _530_0, scope, parent)
-    local _531_ = _530_0
-    local _ = _531_[1]
-    local lhs_ast = _531_[2]
-    local rhs_ast = _531_[3]
-    local _532_ = compiler.compile1(lhs_ast, scope, parent, {nval = 1})
-    local lhs = _532_[1]
-    local _533_ = compiler.compile1(rhs_ast, scope, parent, {nval = 1})
-    local rhs = _533_[1]
+  local function native_comparator(op, _531_0, scope, parent)
+    local _532_ = _531_0
+    local _ = _532_[1]
+    local lhs_ast = _532_[2]
+    local rhs_ast = _532_[3]
+    local _533_ = compiler.compile1(lhs_ast, scope, parent, {nval = 1})
+    local lhs = _533_[1]
+    local _534_ = compiler.compile1(rhs_ast, scope, parent, {nval = 1})
+    local rhs = _534_[1]
     return string.format("(%s %s %s)", tostring(lhs), op, tostring(rhs))
   end
   local function idempotent_comparator(op, chain_op, ast, scope, parent)
@@ -1823,21 +1852,21 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local safe_require = nil
   local function safe_compiler_env()
-    local _540_
+    local _541_
     do
-      local _539_0 = rawget(_G, "utf8")
-      if (nil ~= _539_0) then
-        _540_ = utils.copy(_539_0)
+      local _540_0 = rawget(_G, "utf8")
+      if (nil ~= _540_0) then
+        _541_ = utils.copy(_540_0)
       else
-        _540_ = _539_0
+        _541_ = _540_0
       end
     end
-    return {_VERSION = _VERSION, assert = assert, bit = rawget(_G, "bit"), error = error, getmetatable = safe_getmetatable, ipairs = ipairs, math = utils.copy(math), next = next, pairs = utils.stablepairs, pcall = pcall, print = print, rawequal = rawequal, rawget = rawget, rawlen = rawget(_G, "rawlen"), rawset = rawset, require = safe_require, select = select, setmetatable = setmetatable, string = utils.copy(string), table = utils.copy(table), tonumber = tonumber, tostring = tostring, type = type, utf8 = _540_, xpcall = xpcall}
+    return {_VERSION = _VERSION, assert = assert, bit = rawget(_G, "bit"), error = error, getmetatable = safe_getmetatable, ipairs = ipairs, math = utils.copy(math), next = next, pairs = utils.stablepairs, pcall = pcall, print = print, rawequal = rawequal, rawget = rawget, rawlen = rawget(_G, "rawlen"), rawset = rawset, require = safe_require, select = select, setmetatable = setmetatable, string = utils.copy(string), table = utils.copy(table), tonumber = tonumber, tostring = tostring, type = type, utf8 = _541_, xpcall = xpcall}
   end
   local function combined_mt_pairs(env)
     local combined = {}
-    local _542_ = getmetatable(env)
-    local __index = _542_["__index"]
+    local _543_ = getmetatable(env)
+    local __index = _543_["__index"]
     if ("table" == type(__index)) then
       for k, v in pairs(__index) do
         combined[k] = v
@@ -1851,40 +1880,40 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local function make_compiler_env(ast, scope, parent, _3fopts)
     local provided = nil
     do
-      local _544_0 = (_3fopts or utils.root.options)
-      if ((_G.type(_544_0) == "table") and (_544_0["compiler-env"] == "strict")) then
+      local _545_0 = (_3fopts or utils.root.options)
+      if ((_G.type(_545_0) == "table") and (_545_0["compiler-env"] == "strict")) then
         provided = safe_compiler_env()
-      elseif ((_G.type(_544_0) == "table") and (nil ~= _544_0.compilerEnv)) then
-        local compilerEnv = _544_0.compilerEnv
+      elseif ((_G.type(_545_0) == "table") and (nil ~= _545_0.compilerEnv)) then
+        local compilerEnv = _545_0.compilerEnv
         provided = compilerEnv
-      elseif ((_G.type(_544_0) == "table") and (nil ~= _544_0["compiler-env"])) then
-        local compiler_env = _544_0["compiler-env"]
+      elseif ((_G.type(_545_0) == "table") and (nil ~= _545_0["compiler-env"])) then
+        local compiler_env = _545_0["compiler-env"]
         provided = compiler_env
       else
-        local _ = _544_0
-        provided = safe_compiler_env(false)
+        local _ = _545_0
+        provided = safe_compiler_env()
       end
     end
     local env = nil
-    local function _546_()
+    local function _547_()
       return compiler.scopes.macro
     end
-    local function _547_(symbol)
+    local function _548_(symbol)
       compiler.assert(compiler.scopes.macro, "must call from macro", ast)
       return compiler.scopes.macro.manglings[tostring(symbol)]
     end
-    local function _548_(base)
+    local function _549_(base)
       return utils.sym(compiler.gensym((compiler.scopes.macro or scope), base))
     end
-    local function _549_(form)
+    local function _550_(form)
       compiler.assert(compiler.scopes.macro, "must call from macro", ast)
       return compiler.macroexpand(form, compiler.scopes.macro)
     end
-    env = {["assert-compile"] = compiler.assert, ["ast-source"] = utils["ast-source"], ["comment?"] = utils["comment?"], ["get-scope"] = _546_, ["in-scope?"] = _547_, ["list?"] = utils["list?"], ["macro-loaded"] = macro_loaded, ["multi-sym?"] = utils["multi-sym?"], ["sequence?"] = utils["sequence?"], ["sym?"] = utils["sym?"], ["table?"] = utils["table?"], ["varg?"] = utils["varg?"], _AST = ast, _CHUNK = parent, _IS_COMPILER = true, _SCOPE = scope, _SPECIALS = compiler.scopes.global.specials, _VARARG = utils.varg(), comment = utils.comment, gensym = _548_, list = utils.list, macroexpand = _549_, metadata = compiler.metadata, sequence = utils.sequence, sym = utils.sym, unpack = unpack, version = utils.version, view = view}
+    env = {["assert-compile"] = compiler.assert, ["ast-source"] = utils["ast-source"], ["comment?"] = utils["comment?"], ["get-scope"] = _547_, ["in-scope?"] = _548_, ["list?"] = utils["list?"], ["macro-loaded"] = macro_loaded, ["multi-sym?"] = utils["multi-sym?"], ["sequence?"] = utils["sequence?"], ["sym?"] = utils["sym?"], ["table?"] = utils["table?"], ["varg?"] = utils["varg?"], _AST = ast, _CHUNK = parent, _IS_COMPILER = true, _SCOPE = scope, _SPECIALS = compiler.scopes.global.specials, _VARARG = utils.varg(), comment = utils.comment, gensym = _549_, list = utils.list, macroexpand = _550_, sequence = utils.sequence, sym = utils.sym, unpack = unpack, version = utils.version, view = view}
     env._G = env
     return setmetatable(env, {__index = provided, __newindex = provided, __pairs = combined_mt_pairs})
   end
-  local function _550_(...)
+  local function _551_(...)
     local tbl_17_ = {}
     local i_18_ = #tbl_17_
     for c in string.gmatch((package.config or ""), "([^\n]+)") do
@@ -1896,10 +1925,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
     return tbl_17_
   end
-  local _552_ = _550_(...)
-  local dirsep = _552_[1]
-  local pathsep = _552_[2]
-  local pathmark = _552_[3]
+  local _553_ = _551_(...)
+  local dirsep = _553_[1]
+  local pathsep = _553_[2]
+  local pathmark = _553_[3]
   local pkg_config = {dirsep = (dirsep or "/"), pathmark = (pathmark or "?"), pathsep = (pathsep or ";")}
   local function escapepat(str)
     return string.gsub(str, "[^%w]", "%%%1")
@@ -1912,36 +1941,36 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     local function try_path(path)
       local filename = path:gsub(escapepat(pkg_config.pathmark), no_dot_module)
       local filename2 = path:gsub(escapepat(pkg_config.pathmark), modulename)
-      local _553_0 = (io.open(filename) or io.open(filename2))
-      if (nil ~= _553_0) then
-        local file = _553_0
+      local _554_0 = (io.open(filename) or io.open(filename2))
+      if (nil ~= _554_0) then
+        local file = _554_0
         file:close()
         return filename
       else
-        local _ = _553_0
+        local _ = _554_0
         return nil, ("no file '" .. filename .. "'")
       end
     end
     local function find_in_path(start, _3ftried_paths)
-      local _555_0 = fullpath:match(pattern, start)
-      if (nil ~= _555_0) then
-        local path = _555_0
-        local _556_0, _557_0 = try_path(path)
-        if (nil ~= _556_0) then
-          local filename = _556_0
+      local _556_0 = fullpath:match(pattern, start)
+      if (nil ~= _556_0) then
+        local path = _556_0
+        local _557_0, _558_0 = try_path(path)
+        if (nil ~= _557_0) then
+          local filename = _557_0
           return filename
-        elseif ((_556_0 == nil) and (nil ~= _557_0)) then
-          local error = _557_0
-          local function _559_()
-            local _558_0 = (_3ftried_paths or {})
-            table.insert(_558_0, error)
-            return _558_0
+        elseif ((_557_0 == nil) and (nil ~= _558_0)) then
+          local error = _558_0
+          local function _560_()
+            local _559_0 = (_3ftried_paths or {})
+            table.insert(_559_0, error)
+            return _559_0
           end
-          return find_in_path((start + #path + 1), _559_())
+          return find_in_path((start + #path + 1), _560_())
         end
       else
-        local _ = _555_0
-        local function _561_()
+        local _ = _556_0
+        local function _562_()
           local tried_paths = table.concat((_3ftried_paths or {}), "\n\9")
           if (_VERSION < "Lua 5.4") then
             return ("\n\9" .. tried_paths)
@@ -1949,31 +1978,31 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
             return tried_paths
           end
         end
-        return nil, _561_()
+        return nil, _562_()
       end
     end
     return find_in_path(1)
   end
   local function make_searcher(_3foptions)
-    local function _564_(module_name)
+    local function _565_(module_name)
       local opts = utils.copy(utils.root.options)
       for k, v in pairs((_3foptions or {})) do
         opts[k] = v
       end
       opts["module-name"] = module_name
-      local _565_0, _566_0 = search_module(module_name)
-      if (nil ~= _565_0) then
-        local filename = _565_0
-        local function _567_(...)
+      local _566_0, _567_0 = search_module(module_name)
+      if (nil ~= _566_0) then
+        local filename = _566_0
+        local function _568_(...)
           return utils["fennel-module"].dofile(filename, opts, ...)
         end
-        return _567_, filename
-      elseif ((_565_0 == nil) and (nil ~= _566_0)) then
-        local error = _566_0
+        return _568_, filename
+      elseif ((_566_0 == nil) and (nil ~= _567_0)) then
+        local error = _567_0
         return error
       end
     end
-    return _564_
+    return _565_
   end
   local function dofile_with_searcher(fennel_macro_searcher, filename, opts, ...)
     local searchers = (package.loaders or package.searchers or {})
@@ -1985,35 +2014,35 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   local function fennel_macro_searcher(module_name)
     local opts = nil
     do
-      local _569_0 = utils.copy(utils.root.options)
-      _569_0["module-name"] = module_name
-      _569_0["env"] = "_COMPILER"
-      _569_0["requireAsInclude"] = false
-      _569_0["allowedGlobals"] = nil
-      opts = _569_0
+      local _570_0 = utils.copy(utils.root.options)
+      _570_0["module-name"] = module_name
+      _570_0["env"] = "_COMPILER"
+      _570_0["requireAsInclude"] = false
+      _570_0["allowedGlobals"] = nil
+      opts = _570_0
     end
-    local _570_0 = search_module(module_name, utils["fennel-module"]["macro-path"])
-    if (nil ~= _570_0) then
-      local filename = _570_0
-      local _571_
+    local _571_0 = search_module(module_name, utils["fennel-module"]["macro-path"])
+    if (nil ~= _571_0) then
+      local filename = _571_0
+      local _572_
       if (opts["compiler-env"] == _G) then
-        local function _572_(...)
+        local function _573_(...)
           return dofile_with_searcher(fennel_macro_searcher, filename, opts, ...)
         end
-        _571_ = _572_
+        _572_ = _573_
       else
-        local function _573_(...)
+        local function _574_(...)
           return utils["fennel-module"].dofile(filename, opts, ...)
         end
-        _571_ = _573_
+        _572_ = _574_
       end
-      return _571_, filename
+      return _572_, filename
     end
   end
   local function lua_macro_searcher(module_name)
-    local _576_0 = search_module(module_name, package.path)
-    if (nil ~= _576_0) then
-      local filename = _576_0
+    local _577_0 = search_module(module_name, package.path)
+    if (nil ~= _577_0) then
+      local filename = _577_0
       local code = nil
       do
         local f = io.open(filename)
@@ -2025,10 +2054,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
             return error(..., 0)
           end
         end
-        local function _578_()
+        local function _579_()
           return assert(f:read("*a"))
         end
-        code = close_handlers_10_(_G.xpcall(_578_, (package.loaded.fennel or debug).traceback))
+        code = close_handlers_10_(_G.xpcall(_579_, (package.loaded.fennel or debug).traceback))
       end
       local chunk = load_code(code, make_compiler_env(), filename)
       return chunk, filename
@@ -2036,35 +2065,38 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
   end
   local macro_searchers = {fennel_macro_searcher, lua_macro_searcher}
   local function search_macro_module(modname, n)
-    local _580_0 = macro_searchers[n]
-    if (nil ~= _580_0) then
-      local f = _580_0
-      local _581_0, _582_0 = f(modname)
-      if ((nil ~= _581_0) and true) then
-        local loader = _581_0
-        local _3ffilename = _582_0
+    local _581_0 = macro_searchers[n]
+    if (nil ~= _581_0) then
+      local f = _581_0
+      local _582_0, _583_0 = f(modname)
+      if ((nil ~= _582_0) and true) then
+        local loader = _582_0
+        local _3ffilename = _583_0
         return loader, _3ffilename
       else
-        local _ = _581_0
+        local _ = _582_0
         return search_macro_module(modname, (n + 1))
       end
     end
   end
   local function sandbox_fennel_module(modname)
     if ((modname == "fennel.macros") or (package and package.loaded and ("table" == type(package.loaded[modname])) and (package.loaded[modname].metadata == compiler.metadata))) then
-      return {metadata = compiler.metadata, view = view}
+      local function _586_(_, ...)
+        return (compiler.metadata):setall(...)
+      end
+      return {metadata = {setall = _586_}, view = view}
     end
   end
-  local function _586_(modname)
-    local function _587_()
+  local function _588_(modname)
+    local function _589_()
       local loader, filename = search_macro_module(modname, 1)
       compiler.assert(loader, (modname .. " module not found."))
       macro_loaded[modname] = loader(modname, filename)
       return macro_loaded[modname]
     end
-    return (macro_loaded[modname] or sandbox_fennel_module(modname) or _587_())
+    return (macro_loaded[modname] or sandbox_fennel_module(modname) or _589_())
   end
-  safe_require = _586_
+  safe_require = _588_
   local function add_macros(macros_2a, ast, scope)
     compiler.assert(utils["table?"](macros_2a), "expected macros to be table", ast)
     for k, v in pairs(macros_2a) do
@@ -2074,10 +2106,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     end
     return nil
   end
-  local function resolve_module_name(_588_0, _scope, _parent, opts)
-    local _589_ = _588_0
-    local second = _589_[2]
-    local filename = _589_["filename"]
+  local function resolve_module_name(_590_0, _scope, _parent, opts)
+    local _591_ = _590_0
+    local second = _591_[2]
+    local filename = _591_["filename"]
     local filename0 = (filename or (utils["table?"](second) and second.filename))
     local module_name = utils.root.options["module-name"]
     local modexpr = compiler.compile(second, opts)
@@ -2096,7 +2128,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     if ("import-macros" == tostring(ast[1])) then
       return macro_loaded[modname]
     else
-      return add_macros(macro_loaded[modname], ast, scope, parent)
+      return add_macros(macro_loaded[modname], ast, scope)
     end
   end
   doc_special("require-macros", {"macro-module-name"}, "Load given module and use its contents as macro definitions in current scope.\nMacro module should return a table of macro functions with string keys.\nConsider using import-macros instead as it is more flexible.")
@@ -2134,10 +2166,10 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           return error(..., 0)
         end
       end
-      local function _595_()
+      local function _597_()
         return assert(f:read("*all")):gsub("[\13\n]*$", "")
       end
-      src = close_handlers_10_(_G.xpcall(_595_, (package.loaded.fennel or debug).traceback))
+      src = close_handlers_10_(_G.xpcall(_597_, (package.loaded.fennel or debug).traceback))
     end
     local ret = utils.expr(("require(\"" .. mod .. "\")"), "statement")
     local target = ("package.preload[%q]"):format(mod)
@@ -2167,12 +2199,12 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "expected one argument", ast)
     local modexpr = nil
     do
-      local _598_0, _599_0 = pcall(resolve_module_name, ast, scope, parent, opts)
-      if ((_598_0 == true) and (nil ~= _599_0)) then
-        local modname = _599_0
+      local _600_0, _601_0 = pcall(resolve_module_name, ast, scope, parent, opts)
+      if ((_600_0 == true) and (nil ~= _601_0)) then
+        local modname = _601_0
         modexpr = utils.expr(string.format("%q", modname), "literal")
       else
-        local _ = _598_0
+        local _ = _600_0
         modexpr = compiler.compile1(ast[2], scope, parent, {nval = 1})[1]
       end
     end
@@ -2189,13 +2221,13 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
       utils.root.options["module-name"] = mod
       _ = nil
       local res = nil
-      local function _603_()
-        local _602_0 = search_module(mod)
-        if (nil ~= _602_0) then
-          local fennel_path = _602_0
+      local function _605_()
+        local _604_0 = search_module(mod)
+        if (nil ~= _604_0) then
+          local fennel_path = _604_0
           return include_path(ast, opts, fennel_path, mod, true)
         else
-          local _0 = _602_0
+          local _0 = _604_0
           local lua_path = search_module(mod, package.path)
           if lua_path then
             return include_path(ast, opts, lua_path, mod, false)
@@ -2206,7 +2238,7 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
           end
         end
       end
-      res = ((utils["member?"](mod, (utils.root.options.skipInclude or {})) and opts.fallback(modexpr, true)) or include_circular_fallback(mod, modexpr, opts.fallback, ast) or utils.root.scope.includes[mod] or _603_())
+      res = ((utils["member?"](mod, (utils.root.options.skipInclude or {})) and opts.fallback(modexpr, true)) or include_circular_fallback(mod, modexpr, opts.fallback, ast) or utils.root.scope.includes[mod] or _605_())
       utils.root.options["module-name"] = oldmod
       return res
     end
@@ -2223,9 +2255,18 @@ package.preload["fennel.specials"] = package.preload["fennel.specials"] or funct
     compiler.assert((#ast == 2), "Expected one table argument", ast)
     local macro_tbl = eval_compiler_2a(ast[2], scope, parent)
     compiler.assert(utils["table?"](macro_tbl), "Expected one table argument", ast)
-    return add_macros(macro_tbl, ast, scope, parent)
+    return add_macros(macro_tbl, ast, scope)
   end
   doc_special("macros", {"{:macro-name-1 (fn [...] ...) ... :macro-name-N macro-body-N}"}, "Define all functions in the given table as macros local to the current scope.")
+  SPECIALS["tail!"] = function(ast, scope, _parent, _609_0)
+    local _610_ = _609_0
+    local tail = _610_["tail"]
+    compiler.assert((#ast == 2), "Expected one argument", ast)
+    compiler.assert(utils["list?"](ast[2]), "Expected a call as argument", ast)
+    compiler.assert(tail, "Must be in tail position", ast)
+    return compiler.compile(ast[2], {nval = 1, scope = scope})
+  end
+  doc_special("tail!", {"body"}, "Assert that the body being called is in tail position.")
   SPECIALS["eval-compiler"] = function(ast, scope, parent)
     local old_first = ast[1]
     ast[1] = utils.sym("do")
@@ -2248,13 +2289,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local scopes = {}
   local function make_scope(_3fparent)
     local parent = (_3fparent or scopes.global)
-    local _261_
+    local _262_
     if parent then
-      _261_ = ((parent.depth or 0) + 1)
+      _262_ = ((parent.depth or 0) + 1)
     else
-      _261_ = 0
+      _262_ = 0
     end
-    return {["gensym-base"] = setmetatable({}, {__index = (parent and parent["gensym-base"])}), autogensyms = setmetatable({}, {__index = (parent and parent.autogensyms)}), depth = _261_, gensyms = setmetatable({}, {__index = (parent and parent.gensyms)}), hashfn = (parent and parent.hashfn), includes = setmetatable({}, {__index = (parent and parent.includes)}), macros = setmetatable({}, {__index = (parent and parent.macros)}), manglings = setmetatable({}, {__index = (parent and parent.manglings)}), parent = parent, refedglobals = {}, specials = setmetatable({}, {__index = (parent and parent.specials)}), symmeta = setmetatable({}, {__index = (parent and parent.symmeta)}), unmanglings = setmetatable({}, {__index = (parent and parent.unmanglings)}), vararg = (parent and parent.vararg)}
+    return {["gensym-base"] = setmetatable({}, {__index = (parent and parent["gensym-base"])}), autogensyms = setmetatable({}, {__index = (parent and parent.autogensyms)}), depth = _262_, gensyms = setmetatable({}, {__index = (parent and parent.gensyms)}), hashfn = (parent and parent.hashfn), includes = setmetatable({}, {__index = (parent and parent.includes)}), macros = setmetatable({}, {__index = (parent and parent.macros)}), manglings = setmetatable({}, {__index = (parent and parent.manglings)}), parent = parent, refedglobals = {}, specials = setmetatable({}, {__index = (parent and parent.specials)}), symmeta = setmetatable({}, {__index = (parent and parent.symmeta)}), unmanglings = setmetatable({}, {__index = (parent and parent.unmanglings)}), vararg = (parent and parent.vararg)}
   end
   local function assert_msg(ast, msg)
     local ast_tbl = nil
@@ -2272,10 +2313,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function assert_compile(condition, msg, ast, _3ffallback_ast)
     if not condition then
-      local _264_ = (utils.root.options or {})
-      local error_pinpoint = _264_["error-pinpoint"]
-      local source = _264_["source"]
-      local unfriendly = _264_["unfriendly"]
+      local _265_ = (utils.root.options or {})
+      local error_pinpoint = _265_["error-pinpoint"]
+      local source = _265_["source"]
+      local unfriendly = _265_["unfriendly"]
       local ast0 = nil
       if next(utils["ast-source"](ast)) then
         ast0 = ast
@@ -2299,33 +2340,33 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   scopes.macro = scopes.global
   local serialize_subst = {["\11"] = "\\v", ["\12"] = "\\f", ["\7"] = "\\a", ["\8"] = "\\b", ["\9"] = "\\t", ["\n"] = "n"}
   local function serialize_string(str)
-    local function _269_(_241)
+    local function _270_(_241)
       return ("\\" .. _241:byte())
     end
-    return string.gsub(string.gsub(string.format("%q", str), ".", serialize_subst), "[\128-\255]", _269_)
+    return string.gsub(string.gsub(string.format("%q", str), ".", serialize_subst), "[\128-\255]", _270_)
   end
   local function global_mangling(str)
     if utils["valid-lua-identifier?"](str) then
       return str
     else
-      local function _270_(_241)
+      local function _271_(_241)
         return string.format("_%02x", _241:byte())
       end
-      return ("__fnl_global__" .. str:gsub("[^%w]", _270_))
+      return ("__fnl_global__" .. str:gsub("[^%w]", _271_))
     end
   end
   local function global_unmangling(identifier)
-    local _272_0 = string.match(identifier, "^__fnl_global__(.*)$")
-    if (nil ~= _272_0) then
-      local rest = _272_0
-      local _273_0 = nil
-      local function _274_(_241)
+    local _273_0 = string.match(identifier, "^__fnl_global__(.*)$")
+    if (nil ~= _273_0) then
+      local rest = _273_0
+      local _274_0 = nil
+      local function _275_(_241)
         return string.char(tonumber(_241:sub(2), 16))
       end
-      _273_0 = string.gsub(rest, "_[%da-f][%da-f]", _274_)
-      return _273_0
+      _274_0 = string.gsub(rest, "_[%da-f][%da-f]", _275_)
+      return _274_0
     else
-      local _ = _272_0
+      local _ = _273_0
       return identifier
     end
   end
@@ -2349,10 +2390,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       raw = str
     end
     local mangling = nil
-    local function _278_(_241)
+    local function _279_(_241)
       return string.format("_%02x", _241:byte())
     end
-    mangling = string.gsub(string.gsub(raw, "-", "_"), "[^%w_]", _278_)
+    mangling = string.gsub(string.gsub(raw, "-", "_"), "[^%w_]", _279_)
     local unique = unique_mangling(mangling, mangling, scope, 0)
     scope.unmanglings[unique] = (scope["gensym-base"][str] or str)
     do
@@ -2407,29 +2448,29 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return table.concat(parts, ".")
   end
   local function autogensym(base, scope)
-    local _282_0 = utils["multi-sym?"](base)
-    if (nil ~= _282_0) then
-      local parts = _282_0
+    local _283_0 = utils["multi-sym?"](base)
+    if (nil ~= _283_0) then
+      local parts = _283_0
       return combine_auto_gensym(parts, autogensym(parts[1], scope))
     else
-      local _ = _282_0
-      local function _283_()
+      local _ = _283_0
+      local function _284_()
         local mangling = gensym(scope, base:sub(1, ( - 2)), "auto")
         scope.autogensyms[base] = mangling
         return mangling
       end
-      return (scope.autogensyms[base] or _283_())
+      return (scope.autogensyms[base] or _284_())
     end
   end
   local function check_binding_valid(symbol, scope, ast, _3fopts)
     local name = tostring(symbol)
     local macro_3f = nil
     do
-      local _285_0 = _3fopts
-      if (nil ~= _285_0) then
-        _285_0 = _285_0["macro?"]
+      local _286_0 = _3fopts
+      if (nil ~= _286_0) then
+        _286_0 = _286_0["macro?"]
       end
-      macro_3f = _285_0
+      macro_3f = _286_0
     end
     assert_compile(not name:find("&"), "invalid character: &", symbol)
     assert_compile(not name:find("^%."), "invalid character: .", symbol)
@@ -2527,22 +2568,22 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function flatten_chunk(file_sourcemap, chunk, tab, depth)
     if chunk.leaf then
-      local _297_ = utils["ast-source"](chunk.ast)
-      local filename = _297_["filename"]
-      local line = _297_["line"]
+      local _298_ = utils["ast-source"](chunk.ast)
+      local filename = _298_["filename"]
+      local line = _298_["line"]
       table.insert(file_sourcemap, {filename, line})
       return chunk.leaf
     else
       local tab0 = nil
       do
-        local _298_0 = tab
-        if (_298_0 == true) then
+        local _299_0 = tab
+        if (_299_0 == true) then
           tab0 = "  "
-        elseif (_298_0 == false) then
+        elseif (_299_0 == false) then
           tab0 = ""
-        elseif (_298_0 == tab) then
+        elseif (_299_0 == tab) then
           tab0 = tab
-        elseif (_298_0 == nil) then
+        elseif (_299_0 == nil) then
           tab0 = ""
         else
         tab0 = nil
@@ -2588,7 +2629,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function make_metadata()
-    local function _306_(self, tgt, _3fkey)
+    local function _307_(self, tgt, _3fkey)
       if self[tgt] then
         if (nil ~= _3fkey) then
           return self[tgt][_3fkey]
@@ -2597,12 +2638,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         end
       end
     end
-    local function _309_(self, tgt, key, value)
+    local function _310_(self, tgt, key, value)
       self[tgt] = (self[tgt] or {})
       self[tgt][key] = value
       return tgt
     end
-    local function _310_(self, tgt, ...)
+    local function _311_(self, tgt, ...)
       local kv_len = select("#", ...)
       local kvs = {...}
       if ((kv_len % 2) ~= 0) then
@@ -2614,7 +2655,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       end
       return tgt
     end
-    return setmetatable({}, {__index = {get = _306_, set = _309_, setall = _310_}, __mode = "k"})
+    return setmetatable({}, {__index = {get = _307_, set = _310_, setall = _311_}, __mode = "k"})
   end
   local function exprs1(exprs)
     return table.concat(utils.map(exprs, tostring), ", ")
@@ -2660,14 +2701,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
     if opts.target then
       local result = exprs1(exprs)
-      local function _318_()
+      local function _319_()
         if (result == "") then
           return "nil"
         else
           return result
         end
       end
-      emit(parent, string.format("%s = %s", opts.target, _318_()), ast)
+      emit(parent, string.format("%s = %s", opts.target, _319_()), ast)
     end
     if (opts.tail or opts.target) then
       return {returned = true}
@@ -2679,16 +2720,16 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local function find_macro(ast, scope)
     local macro_2a = nil
     do
-      local _321_0 = utils["sym?"](ast[1])
-      if (_321_0 ~= nil) then
-        local _322_0 = tostring(_321_0)
-        if (_322_0 ~= nil) then
-          macro_2a = scope.macros[_322_0]
+      local _322_0 = utils["sym?"](ast[1])
+      if (_322_0 ~= nil) then
+        local _323_0 = tostring(_322_0)
+        if (_323_0 ~= nil) then
+          macro_2a = scope.macros[_323_0]
         else
-          macro_2a = _322_0
+          macro_2a = _323_0
         end
       else
-        macro_2a = _321_0
+        macro_2a = _322_0
       end
     end
     local multi_sym_parts = utils["multi-sym?"](ast[1])
@@ -2700,12 +2741,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       return macro_2a
     end
   end
-  local function propagate_trace_info(_326_0, _index, node)
-    local _327_ = _326_0
-    local byteend = _327_["byteend"]
-    local bytestart = _327_["bytestart"]
-    local filename = _327_["filename"]
-    local line = _327_["line"]
+  local function propagate_trace_info(_327_0, _index, node)
+    local _328_ = _327_0
+    local byteend = _328_["byteend"]
+    local bytestart = _328_["bytestart"]
+    local filename = _328_["filename"]
+    local line = _328_["line"]
     do
       local src = utils["ast-source"](node)
       if (("table" == type(node)) and (filename ~= src.filename)) then
@@ -2718,8 +2759,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   local function quote_literal_nils(index, node, parent)
     if (parent and utils["list?"](parent)) then
       for i = 1, utils.maxn(parent) do
-        local _329_0 = parent[i]
-        if (_329_0 == nil) then
+        local _330_0 = parent[i]
+        if (_330_0 == nil) then
           parent[i] = utils.sym("nil")
         end
       end
@@ -2727,10 +2768,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return index, node, parent
   end
   local function comp(f, g)
-    local function _332_(...)
+    local function _333_(...)
       return f(g(...))
     end
-    return _332_
+    return _333_
   end
   local function built_in_3f(m)
     local found_3f = false
@@ -2741,36 +2782,36 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return found_3f
   end
   local function macroexpand_2a(ast, scope, _3fonce)
-    local _333_0 = nil
+    local _334_0 = nil
     if utils["list?"](ast) then
-      _333_0 = find_macro(ast, scope)
+      _334_0 = find_macro(ast, scope)
     else
-    _333_0 = nil
+    _334_0 = nil
     end
-    if (_333_0 == false) then
+    if (_334_0 == false) then
       return ast
-    elseif (nil ~= _333_0) then
-      local macro_2a = _333_0
+    elseif (nil ~= _334_0) then
+      local macro_2a = _334_0
       local old_scope = scopes.macro
       local _ = nil
       scopes.macro = scope
       _ = nil
       local ok, transformed = nil, nil
-      local function _335_()
+      local function _336_()
         return macro_2a(unpack(ast, 2))
       end
-      local function _336_()
+      local function _337_()
         if built_in_3f(macro_2a) then
           return tostring
         else
           return debug.traceback
         end
       end
-      ok, transformed = xpcall(_335_, _336_())
-      local function _337_(...)
+      ok, transformed = xpcall(_336_, _337_())
+      local function _338_(...)
         return propagate_trace_info(ast, ...)
       end
-      utils["walk-tree"](transformed, comp(_337_, quote_literal_nils))
+      utils["walk-tree"](transformed, comp(_338_, quote_literal_nils))
       scopes.macro = old_scope
       assert_compile(ok, transformed, ast)
       if (_3fonce or not transformed) then
@@ -2779,7 +2820,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         return macroexpand_2a(transformed, scope)
       end
     else
-      local _ = _333_0
+      local _ = _334_0
       return ast
     end
   end
@@ -2811,13 +2852,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     assert_compile((utils["sym?"](ast[1]) or utils["list?"](ast[1]) or ("string" == type(ast[1]))), ("cannot call literal value " .. tostring(ast[1])), ast)
     for i = 2, len do
       local subexprs = nil
-      local _343_
+      local _344_
       if (i ~= len) then
-        _343_ = 1
+        _344_ = 1
       else
-      _343_ = nil
+      _344_ = nil
       end
-      subexprs = compile1(ast[i], scope, parent, {nval = _343_})
+      subexprs = compile1(ast[i], scope, parent, {nval = _344_})
       table.insert(fargs, subexprs[1])
       if (i == len) then
         for j = 2, #subexprs do
@@ -2855,13 +2896,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function compile_varg(ast, scope, parent, opts)
-    local _348_
+    local _349_
     if scope.hashfn then
-      _348_ = "use $... in hashfn"
+      _349_ = "use $... in hashfn"
     else
-      _348_ = "unexpected vararg"
+      _349_ = "unexpected vararg"
     end
-    assert_compile(scope.vararg, _348_, ast)
+    assert_compile(scope.vararg, _349_, ast)
     return handle_compile_opts({utils.expr("...", "varg")}, parent, opts, ast)
   end
   local function compile_sym(ast, scope, parent, opts)
@@ -2876,20 +2917,20 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     return handle_compile_opts({e}, parent, opts, ast)
   end
   local function serialize_number(n)
-    local _351_0 = string.gsub(tostring(n), ",", ".")
-    return _351_0
+    local _352_0 = string.gsub(tostring(n), ",", ".")
+    return _352_0
   end
   local function compile_scalar(ast, _scope, parent, opts)
     local serialize = nil
     do
-      local _352_0 = type(ast)
-      if (_352_0 == "nil") then
+      local _353_0 = type(ast)
+      if (_353_0 == "nil") then
         serialize = tostring
-      elseif (_352_0 == "boolean") then
+      elseif (_353_0 == "boolean") then
         serialize = tostring
-      elseif (_352_0 == "string") then
+      elseif (_353_0 == "string") then
         serialize = serialize_string
-      elseif (_352_0 == "number") then
+      elseif (_353_0 == "number") then
         serialize = serialize_number
       else
       serialize = nil
@@ -2902,8 +2943,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       if ((type(k) == "string") and utils["valid-lua-identifier?"](k)) then
         return k
       else
-        local _354_ = compile1(k, scope, parent, {nval = 1})
-        local compiled = _354_[1]
+        local _355_ = compile1(k, scope, parent, {nval = 1})
+        local compiled = _355_[1]
         return ("[" .. tostring(compiled) .. "]")
       end
     end
@@ -2929,12 +2970,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     do
       local tbl_17_ = buffer
       local i_18_ = #tbl_17_
-      for k, v in utils.stablepairs(ast) do
+      for k in utils.stablepairs(ast) do
         local val_19_ = nil
         if not keys[k] then
-          local _357_ = compile1(ast[k], scope, parent, {nval = 1})
-          local v0 = _357_[1]
-          val_19_ = string.format("%s = %s", escape_key(k), tostring(v0))
+          local _358_ = compile1(ast[k], scope, parent, {nval = 1})
+          local v = _358_[1]
+          val_19_ = string.format("%s = %s", escape_key(k), tostring(v))
         else
         val_19_ = nil
         end
@@ -2965,12 +3006,12 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
   end
   local function destructure(to, from, ast, scope, parent, opts)
     local opts0 = (opts or {})
-    local _361_ = opts0
-    local declaration = _361_["declaration"]
-    local forceglobal = _361_["forceglobal"]
-    local forceset = _361_["forceset"]
-    local isvar = _361_["isvar"]
-    local symtype = _361_["symtype"]
+    local _362_ = opts0
+    local declaration = _362_["declaration"]
+    local forceglobal = _362_["forceglobal"]
+    local forceset = _362_["forceset"]
+    local isvar = _362_["isvar"]
+    local symtype = _362_["symtype"]
     local symtype0 = ("_" .. (symtype or "dst"))
     local setter = nil
     if declaration then
@@ -2986,8 +3027,8 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         return declare_local(symbol, nil, scope, symbol, new_manglings)
       else
         local parts = (utils["multi-sym?"](raw) or {raw})
-        local _363_ = parts
-        local first = _363_[1]
+        local _364_ = parts
+        local first = _364_[1]
         local meta = scope.symmeta[first]
         assert_compile(not raw:find(":"), "cannot set method sym", symbol)
         if ((#parts == 1) and not forceset) then
@@ -3008,14 +3049,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
     local function compile_top_target(lvalues)
       local inits = nil
-      local function _368_(_241)
+      local function _369_(_241)
         if scope.manglings[_241] then
           return _241
         else
           return "nil"
         end
       end
-      inits = utils.map(lvalues, _368_)
+      inits = utils.map(lvalues, _369_)
       local init = table.concat(inits, ", ")
       local lvalue = table.concat(lvalues, ", ")
       local plast = parent[#parent]
@@ -3053,7 +3094,7 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     local unpack_fn = "function (t, k, e)\n                        local mt = getmetatable(t)\n                        if 'table' == type(mt) and mt.__fennelrest then\n                          return mt.__fennelrest(t, k)\n                        elseif e then\n                          local rest = {}\n                          for k, v in pairs(t) do\n                            if not e[k] then rest[k] = v end\n                          end\n                          return rest\n                        else\n                          return {(table.unpack or unpack)(t, k)}\n                        end\n                      end"
     local function destructure_kv_rest(s, v, left, excluded_keys, destructure1)
       local exclude_str = nil
-      local _375_
+      local _376_
       do
         local tbl_17_ = {}
         local i_18_ = #tbl_17_
@@ -3064,9 +3105,9 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
             tbl_17_[i_18_] = val_19_
           end
         end
-        _375_ = tbl_17_
+        _376_ = tbl_17_
       end
-      exclude_str = table.concat(_375_, ", ")
+      exclude_str = table.concat(_376_, ", ")
       local subexpr = utils.expr(string.format(string.gsub(("(" .. unpack_fn .. ")(%s, %s, {%s})"), "\n%s*", " "), s, tostring(v), exclude_str), "expression")
       return destructure1(v, {subexpr}, left)
     end
@@ -3081,16 +3122,16 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       local s = gensym(scope, symtype0)
       local right = nil
       do
-        local _377_0 = nil
+        local _378_0 = nil
         if top_3f then
-          _377_0 = exprs1(compile1(from, scope, parent))
+          _378_0 = exprs1(compile1(from, scope, parent))
         else
-          _377_0 = exprs1(rightexprs)
+          _378_0 = exprs1(rightexprs)
         end
-        if (_377_0 == "") then
+        if (_378_0 == "") then
           right = "nil"
-        elseif (nil ~= _377_0) then
-          local right0 = _377_0
+        elseif (nil ~= _378_0) then
+          local right0 = _378_0
           right = right0
         else
         right = nil
@@ -3195,8 +3236,11 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     if opts.requireAsInclude then
       scope.specials.require = require_include
     end
-    local _391_ = utils.root
-    _391_["set-reset"](_391_)
+    if opts.assertAsRepl then
+      scope.macros.assert = scope.macros["assert-repl"]
+    end
+    local _393_ = utils.root
+    _393_["set-reset"](_393_)
     utils.root.chunk, utils.root.scope, utils.root.options = chunk, scope, opts
     for i = 1, #asts do
       local exprs = compile1(asts[i], scope, chunk, {nval = (((i < #asts) and 0) or nil), tail = (i == #asts)})
@@ -3247,14 +3291,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
         info.currentline = (remap[info.currentline][2] or -1)
       end
       if (info.what == "Lua") then
-        local function _396_()
+        local function _398_()
           if info.name then
             return ("'" .. info.name .. "'")
           else
             return "?"
           end
         end
-        return string.format("  %s:%d: in function %s", info.short_src, info.currentline, _396_())
+        return string.format("  %s:%d: in function %s", info.short_src, info.currentline, _398_())
       elseif (info.short_src == "(tail call)") then
         return "  (tail call)"
       else
@@ -3278,11 +3322,11 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       local done_3f, level = false, (_3fstart or 2)
       while not done_3f do
         do
-          local _400_0 = debug.getinfo(level, "Sln")
-          if (_400_0 == nil) then
+          local _402_0 = debug.getinfo(level, "Sln")
+          if (_402_0 == nil) then
             done_3f = true
-          elseif (nil ~= _400_0) then
-            local info = _400_0
+          elseif (nil ~= _402_0) then
+            local info = _402_0
             table.insert(lines, traceback_frame(info))
           end
         end
@@ -3292,14 +3336,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
     end
   end
   local function entry_transform(fk, fv)
-    local function _403_(k, v)
+    local function _405_(k, v)
       if (type(k) == "number") then
         return k, fv(v)
       else
         return fk(k), fv(v)
       end
     end
-    return _403_
+    return _405_
   end
   local function mixed_concat(t, joiner)
     local seen = {}
@@ -3344,10 +3388,10 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       return res[1]
     elseif utils["list?"](form) then
       local mapped = nil
-      local function _408_()
+      local function _410_()
         return nil
       end
-      mapped = utils.kvmap(form, entry_transform(_408_, q))
+      mapped = utils.kvmap(form, entry_transform(_410_, q))
       local filename = nil
       if form.filename then
         filename = string.format("%q", form.filename)
@@ -3365,13 +3409,13 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       else
         filename = "nil"
       end
-      local _411_
+      local _413_
       if source then
-        _411_ = source.line
+        _413_ = source.line
       else
-        _411_ = "nil"
+        _413_ = "nil"
       end
-      return string.format("setmetatable({%s}, {filename=%s, line=%s, sequence=%s})", mixed_concat(mapped, ", "), filename, _411_, "(getmetatable(sequence()))['sequence']")
+      return string.format("setmetatable({%s}, {filename=%s, line=%s, sequence=%s})", mixed_concat(mapped, ", "), filename, _413_, "(getmetatable(sequence()))['sequence']")
     elseif (type(form) == "table") then
       local mapped = utils.kvmap(form, entry_transform(q, q))
       local source = getmetatable(form)
@@ -3381,14 +3425,14 @@ package.preload["fennel.compiler"] = package.preload["fennel.compiler"] or funct
       else
         filename = "nil"
       end
-      local function _414_()
+      local function _416_()
         if source then
           return source.line
         else
           return "nil"
         end
       end
-      return string.format("setmetatable({%s}, {filename=%s, line=%s})", mixed_concat(mapped, ", "), filename, _414_())
+      return string.format("setmetatable({%s}, {filename=%s, line=%s})", mixed_concat(mapped, ", "), filename, _416_())
     elseif (type(form) == "string") then
       return serialize_string(form)
     else
@@ -3610,7 +3654,9 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       else
         r = getbyte({["stack-size"] = #stack})
       end
-      byteindex = (byteindex + 1)
+      if r then
+        byteindex = (byteindex + 1)
+      end
       if (r and char_starter_3f(r)) then
         col = (col + 1)
       end
@@ -3620,14 +3666,14 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       return r
     end
     local function whitespace_3f(b)
-      local function _216_()
-        local _215_0 = options.whitespace
-        if (nil ~= _215_0) then
-          _215_0 = _215_0[b]
+      local function _217_()
+        local _216_0 = options.whitespace
+        if (nil ~= _216_0) then
+          _216_0 = _216_0[b]
         end
-        return _215_0
+        return _216_0
       end
-      return ((b == 32) or ((9 <= b) and (b <= 13)) or _216_())
+      return ((b == 32) or ((9 <= b) and (b <= 13)) or _217_())
     end
     local function parse_error(msg, _3fcol_adjust)
       local col0 = (col + (_3fcol_adjust or -1))
@@ -3647,25 +3693,25 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         return nil
       end
       local function dispatch(v)
-        local _220_0 = stack[#stack]
-        if (_220_0 == nil) then
+        local _221_0 = stack[#stack]
+        if (_221_0 == nil) then
           retval, done_3f, whitespace_since_dispatch = v, true, false
           return nil
-        elseif ((_G.type(_220_0) == "table") and (nil ~= _220_0.prefix)) then
-          local prefix = _220_0.prefix
+        elseif ((_G.type(_221_0) == "table") and (nil ~= _221_0.prefix)) then
+          local prefix = _221_0.prefix
           local source0 = nil
           do
-            local _221_0 = table.remove(stack)
-            set_source_fields(_221_0)
-            source0 = _221_0
+            local _222_0 = table.remove(stack)
+            set_source_fields(_222_0)
+            source0 = _222_0
           end
           local list = utils.list(utils.sym(prefix, source0), v)
           for k, v0 in pairs(source0) do
             list[k] = v0
           end
           return dispatch(list)
-        elseif (nil ~= _220_0) then
-          local top = _220_0
+        elseif (nil ~= _221_0) then
+          local top = _221_0
           whitespace_since_dispatch = false
           return table.insert(top, v)
         end
@@ -3673,13 +3719,13 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       local close_table = nil
       local function badend(cause)
         local accum = utils.map(stack, "closer")
-        local _223_
+        local _224_
         if (#stack == 1) then
-          _223_ = ""
+          _224_ = ""
         else
-          _223_ = "s"
+          _224_ = "s"
         end
-        parse_error(string.format("expected closing delimiter%s %s", _223_, string.char(unpack(accum))))
+        parse_error(string.format("expected closing delimiter%s %s", _224_, string.char(unpack(accum))))
         if (cause == "eof") then
           for i = #accum, 2, -1 do
             close_table(accum[i])
@@ -3699,11 +3745,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       end
       local function parse_comment(b, contents)
         if (b and (10 ~= b)) then
-          local function _227_()
+          local function _228_()
             table.insert(contents, string.char(b))
             return contents
           end
-          return parse_comment(getb(), _227_())
+          return parse_comment(getb(), _228_())
         elseif comments then
           ungetb(10)
           return dispatch(utils.comment(table.concat(contents), {filename = filename, line = line}))
@@ -3729,12 +3775,12 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         return dispatch(setmetatable(tbl, mt))
       end
       local function add_comment_at(comments0, index, node)
-        local _231_0 = comments0[index]
-        if (nil ~= _231_0) then
-          local existing = _231_0
+        local _232_0 = comments0[index]
+        if (nil ~= _232_0) then
+          local existing = _232_0
           return table.insert(existing, node)
         else
-          local _ = _231_0
+          local _ = _232_0
           comments0[index] = {node}
           return nil
         end
@@ -3814,16 +3860,16 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         end
         local state0 = nil
         do
-          local _242_0 = {state, b}
-          if ((_G.type(_242_0) == "table") and (_242_0[1] == "base") and (_242_0[2] == 92)) then
+          local _243_0 = {state, b}
+          if ((_G.type(_243_0) == "table") and (_243_0[1] == "base") and (_243_0[2] == 92)) then
             state0 = "backslash"
-          elseif ((_G.type(_242_0) == "table") and (_242_0[1] == "base") and (_242_0[2] == 34)) then
+          elseif ((_G.type(_243_0) == "table") and (_243_0[1] == "base") and (_243_0[2] == 34)) then
             state0 = "done"
-          elseif ((_G.type(_242_0) == "table") and (_242_0[1] == "backslash") and (_242_0[2] == 10)) then
+          elseif ((_G.type(_243_0) == "table") and (_243_0[1] == "backslash") and (_243_0[2] == 10)) then
             table.remove(chars, (#chars - 1))
             state0 = "base"
           else
-            local _ = _242_0
+            local _ = _243_0
             state0 = "base"
           end
         end
@@ -3845,11 +3891,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         table.remove(stack)
         local raw = table.concat(chars)
         local formatted = raw:gsub("[\7-\13]", escape_char)
-        local _246_0 = (rawget(_G, "loadstring") or load)(("return " .. formatted))
-        if (nil ~= _246_0) then
-          local load_fn = _246_0
+        local _247_0 = (rawget(_G, "loadstring") or load)(("return " .. formatted))
+        if (nil ~= _247_0) then
+          local load_fn = _247_0
           return dispatch(load_fn())
-        elseif (_246_0 == nil) then
+        elseif (_247_0 == nil) then
           return parse_error(("Invalid string: " .. raw))
         end
       end
@@ -3882,13 +3928,13 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
           dispatch((tonumber(number_with_stripped_underscores) or parse_error(("could not read number \"" .. rawstr .. "\""))))
           return true
         else
-          local _252_0 = tonumber(number_with_stripped_underscores)
-          if (nil ~= _252_0) then
-            local x = _252_0
+          local _253_0 = tonumber(number_with_stripped_underscores)
+          if (nil ~= _253_0) then
+            local x = _253_0
             dispatch(x)
             return true
           else
-            local _ = _252_0
+            local _ = _253_0
             return false
           end
         end
@@ -3935,7 +3981,7 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
         elseif delims[b] then
           close_table0(b)
         elseif (b == 34) then
-          parse_string(b)
+          parse_string()
         elseif prefixes[b] then
           parse_prefix(b)
         elseif (sym_char_3f(b) or (b == string.byte("~"))) then
@@ -3953,11 +3999,11 @@ package.preload["fennel.parser"] = package.preload["fennel.parser"] or function(
       end
       return parse_loop(skip_whitespace(getb()))
     end
-    local function _259_()
+    local function _260_()
       stack, line, byteindex, col, lastb = {}, 1, 0, 0, nil
       return nil
     end
-    return parse_stream, _259_
+    return parse_stream, _260_
   end
   local function parser(stream_or_string, _3ffilename, _3foptions)
     local filename = (_3ffilename or "unknown")
@@ -4590,7 +4636,7 @@ package.preload["fennel.view"] = package.preload["fennel.view"] or function(...)
 end
 package.preload["fennel.utils"] = package.preload["fennel.utils"] or function(...)
   local view = require("fennel.view")
-  local version = "1.3.2-dev"
+  local version = "1.4.0-dev"
   local function luajit_vm_3f()
     return ((nil ~= _G.jit) and (type(_G.jit) == "table") and (nil ~= _G.jit.on) and (nil ~= _G.jit.off) and (type(_G.jit.version_num) == "number"))
   end
@@ -5058,7 +5104,8 @@ package.preload["fennel.utils"] = package.preload["fennel.utils"] or function(..
     return symbol.quoted
   end
   local function idempotent_expr_3f(x)
-    return ((type(x) == "string") or (type(x) == "integer") or (type(x) == "number") or (sym_3f(x) and not multi_sym_3f(x)))
+    local t = type(x)
+    return ((t == "string") or (t == "integer") or (t == "number") or (t == "boolean") or (sym_3f(x) and not multi_sym_3f(x)))
   end
   local function ast_source(ast)
     if (table_3f(ast) or sequence_3f(ast)) then
@@ -5192,14 +5239,14 @@ local function eval(str, _3foptions, ...)
   local env = eval_env(opts.env, opts)
   local lua_source = compiler["compile-string"](str, opts)
   local loader = nil
-  local function _735_(...)
+  local function _746_(...)
     if opts.filename then
       return ("@" .. opts.filename)
     else
       return str
     end
   end
-  loader = specials["load-code"](lua_source, env, _735_(...))
+  loader = specials["load-code"](lua_source, env, _746_(...))
   opts.filename = nil
   return loader(...)
 end
@@ -5224,10 +5271,10 @@ local function syntax()
     out[k] = {["binding-form?"] = utils["member?"](k, binding_3f), ["body-form?"] = utils["member?"](k, body_3f), ["define?"] = utils["member?"](k, define_3f), ["macro?"] = true}
   end
   for k, v in pairs(_G) do
-    local _736_0 = type(v)
-    if (_736_0 == "function") then
+    local _747_0 = type(v)
+    if (_747_0 == "function") then
       out[k] = {["function?"] = true, ["global?"] = true}
-    elseif (_736_0 == "table") then
+    elseif (_747_0 == "table") then
       for k2, v2 in pairs(v) do
         if (("function" == type(v2)) and (k ~= "_G")) then
           out[(k .. "." .. k2)] = {["function?"] = true, ["global?"] = true}
@@ -5247,19 +5294,21 @@ utils["fennel-module"] = mod
 do
   local module_name = "fennel.macros"
   local _ = nil
-  local function _739_()
+  local function _750_()
     return mod
   end
-  package.preload[module_name] = _739_
+  package.preload[module_name] = _750_
   _ = nil
   local env = nil
   do
-    local _740_0 = specials["make-compiler-env"](nil, compiler.scopes.compiler, {})
-    _740_0["utils"] = utils
-    _740_0["fennel"] = mod
-    env = _740_0
+    local _751_0 = specials["make-compiler-env"](nil, compiler.scopes.compiler, {})
+    _751_0["utils"] = utils
+    _751_0["fennel"] = mod
+    env = _751_0
   end
-  local built_ins = eval([===[;; These macros are awkward because their definition cannot rely on the any
+  local built_ins = eval([===[;; fennel-ls: macro-file
+  
+  ;; These macros are awkward because their definition cannot rely on the any
   ;; built-in macros, only special forms. (no when, no icollect, etc)
   
   (fn copy [t]
@@ -5382,7 +5431,7 @@ do
               (table.remove iter-out i)))))
     (assert (or (not found?) (sym? into) (table? into) (list? into))
             "expected table, function call, or symbol in &into clause")
-    (values into iter-out))
+    (values into iter-out found?))
   
   (fn collect* [iter-tbl key-expr value-expr ...]
     "Return a table made by running an iterator and evaluating an expression that
@@ -5420,17 +5469,22 @@ do
     (assert (not= nil value-expr) "expected table value expression")
     (assert (= nil ...)
             "expected exactly one body expression. Wrap multiple expressions in do")
-    (let [(into iter) (extract-into iter-tbl)]
-      `(let [tbl# ,into]
-         ;; believe it or not, using a var here has a pretty good performance
-         ;; boost: https://p.hagelb.org/icollect-performance.html
-         (var i# (length tbl#))
-         (,how ,iter
-               (let [val# ,value-expr]
-                 (when (not= nil val#)
-                   (set i# (+ i# 1))
-                   (tset tbl# i# val#))))
-         tbl#)))
+    (let [(into iter has-into?) (extract-into iter-tbl)]
+      (if has-into?
+          `(let [tbl# ,into]
+             (,how ,iter (table.insert tbl# ,value-expr))
+             tbl#)
+          ;; believe it or not, using a var here has a pretty good performance
+          ;; boost: https://p.hagelb.org/icollect-performance.html
+          ;; but it doesn't always work with &into clauses, so skip if that's used
+          `(let [tbl# []]
+             (var i# 0)
+             (,how ,iter
+                   (let [val# ,value-expr]
+                     (when (not= nil val#)
+                       (set i# (+ i# 1))
+                       (tset tbl# i# val#))))
+             tbl#))))
   
   (fn icollect* [iter-tbl value-expr ...]
     "Return a sequential table made by running an iterator and evaluating an
@@ -5564,7 +5618,7 @@ do
             (.. "Expected n to be an integer >= 0, got " (tostring n)))
     (let [let-syms (list)
           let-values (if (= 1 (select "#" ...)) ... `(values ,...))]
-      (for [i 1 n]
+      (for [_ 1 n]
         (table.insert let-syms (gensym)))
       (if (= n 0) `(values)
           `(let [,let-syms ,let-values]
@@ -5649,6 +5703,30 @@ do
               (tset scope.macros import-key (. macros* macro-name))))))
     nil)
   
+  (fn assert-repl* [condition message ?opts]
+    "Drop into a debug repl and print the message when condition is false/nil.
+  Takes an optional table of arguments which will be passed to fennel.repl."
+    (fn add-locals [{: symmeta : parent} locals]
+      (each [name (pairs symmeta)]
+        (tset locals name (sym name)))
+      (if parent (add-locals parent locals) locals))
+    `(let [condition# ,condition
+           message# (or ,message "assertion failed, entering repl.")]
+       (if (not condition#)
+           (let [opts# (or ,?opts {:assert-repl? true
+                                   :readChunk (?. _G :___repl___ :readChunk)
+                                   :onError (?. _G :___repl___ :onError)
+                                   :onValued (?. _G :___repl___ :onValued)})
+                 fennel# (require (or opts#.moduleName :fennel))
+                 locals# ,(add-locals (get-scope) [])]
+             (set opts#.message (fennel#.traceback message#))
+             (set opts#.env (collect [k# v# (pairs _G) &into locals#]
+                              (if (= nil (. locals# k#)) (values k# v#))))
+             (_G.assert (fennel#.repl opts#) message#))
+           ;; `assert` returns *all* params on success, but omitting opts# to
+           ;; defensively prevent accidental leakage of REPL opts into code
+           (values condition# message#))))
+  
   {:-> ->*
    :->> ->>*
    :-?> -?>*
@@ -5669,14 +5747,17 @@ do
    :pick-values pick-values*
    :macro macro*
    :macrodebug macrodebug*
-   :import-macros import-macros*}
+   :import-macros import-macros*
+   :assert-repl assert-repl*}
   ]===], {env = env, filename = "src/fennel/macros.fnl", moduleName = module_name, scope = compiler.scopes.compiler, useMetadata = true})
   local _0 = nil
   for k, v in pairs(built_ins) do
     compiler.scopes.global.macros[k] = v
   end
   _0 = nil
-  local match_macros = eval([===[;;; Pattern matching
+  local match_macros = eval([===[;; fennel-ls: macro-file
+  
+  ;;; Pattern matching
   ;; This is separated out so we can use the "core" macros during the
   ;; implementation of pattern matching.
   
@@ -5779,7 +5860,7 @@ do
                      (let [in-pattern (symbols-in-pattern pattern)]
                        (if ?symbols
                          (do
-                           (each [name symbol (pairs ?symbols)]
+                           (each [name (pairs ?symbols)]
                              (when (not (. in-pattern name))
                                (tset ?symbols name nil)))
                            ?symbols)
@@ -5795,7 +5876,7 @@ do
       (if (= 0 (length bindings))
         ;; no bindings special case generates simple code
         (let [condition
-              (icollect [i subpattern (ipairs pattern) &into `(or)]
+              (icollect [_ subpattern (ipairs pattern) &into `(or)]
                 (let [(subcondition subbindings) (case-pattern vals subpattern unifications opts)]
                   subcondition))]
           (values
@@ -5808,7 +5889,7 @@ do
               bindings-mangled (icollect [_ binding (ipairs bindings)]
                                  (gensym (tostring binding)))
               pre-bindings `(if)]
-          (each [i subpattern (ipairs pattern)]
+          (each [_ subpattern (ipairs pattern)]
             (let [(subcondition subbindings) (case-guard vals subpattern guards {} case-pattern opts)]
               (table.insert pre-bindings subcondition)
               (table.insert pre-bindings `(let ,subbindings
@@ -5974,7 +6055,7 @@ do
         (case-condition (list val) clauses match?)
         ;; protect against multiple evaluation of the value, bind against as
         ;; many values as we ever match against in the clauses.
-        (let [vals (fcollect [i 1 vals-count &into (list)] (gensym))]
+        (let [vals (fcollect [_ 1 vals-count &into (list)] (gensym))]
           (list `let [vals val] (case-condition vals clauses match?))))))
   
   (fn case* [val ...]