diff --git a/nomsu_environment.lua b/nomsu_environment.lua
index ca22389..51100fc 100644
--- a/nomsu_environment.lua
+++ b/nomsu_environment.lua
@@ -137,6 +137,8 @@ local nomsu_environment = Importer({
   compile_error_at = compile_error,
   _1_forked = _1_forked,
   import_to_1_from = import_to_1_from,
+  exit = os.exit,
+  quit = os.exit,
   _1_parsed = function(nomsu_code, syntax_version)
     if type(nomsu_code) == 'string' then
       local filename = Files.spoof(nomsu_code)
@@ -333,7 +335,7 @@ local nomsu_environment = Importer({
                 break
               end
               local code
-              if optimization ~= 0 and Files.read(lua_filename) then
+              if optimization ~= 0 and Files.exists(lua_filename) then
                 local file = Files.read(lua_filename)
                 code = LuaCode:from(Source(filename, 1, #file), file)
               else
diff --git a/nomsu_environment.moon b/nomsu_environment.moon
index 5d7a02c..a5b1169 100644
--- a/nomsu_environment.moon
+++ b/nomsu_environment.moon
@@ -58,7 +58,7 @@ nomsu_environment = Importer{
     -- Nomsu functions:
     _1_as_nomsu:tree_to_nomsu, _1_as_inline_nomsu:tree_to_inline_nomsu,
     compile: compile, _1_as_lua: compile, compile_error_at:compile_error,
-    :_1_forked, :import_to_1_from,
+    :_1_forked, :import_to_1_from, exit:os.exit, quit:os.exit,
 
     _1_parsed: (nomsu_code, syntax_version)->
         if type(nomsu_code) == 'string'
@@ -185,7 +185,7 @@ nomsu_environment = Importer{
                     did_anything = true
                     continue
                 -- TODO: don't automatically use precompiled version?
-                code = if optimization != 0 and Files.read(lua_filename)
+                code = if optimization != 0 and Files.exists(lua_filename)
                     -- TODO: use a checksum?
                     file = Files.read(lua_filename)
                     LuaCode\from(Source(filename, 1, #file), file)
diff --git a/tools/repl.nom b/tools/repl.nom
index c35abc5..58a24d3 100755
--- a/tools/repl.nom
+++ b/tools/repl.nom
@@ -7,7 +7,6 @@ use "lib/os.nom"
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-externally [quit, exit] all mean: lua> "os.exit(0)"
 externally (help) means:
     say ("
         This is the Nomsu v\(Nomsu version) interactive console.