declare the variables introduced by for loop into scope #44

moonscript/compile/statement.lua

@@ -157,6 +157,9 @@ line_compile = {
     }), " do")
     do
       local _with_0 = self:block(loop)
+      _with_0:declare({
+        name
+      })
       _with_0:stms(block)
       return _with_0
     end
@@ -195,6 +198,7 @@ line_compile = {
     end
     do
       local _with_0 = self:block(loop)
+      _with_0:declare(names)
       _with_0:stms(block)
       return _with_0
     end

moonscript/compile/statement.moon

@@ -91,6 +91,7 @@ line_compile =
     _, name, bounds, block = unpack node
     loop = @line "for ", @name(name), " = ", @value({"explist", unpack bounds}), " do"
     with @block loop
+      \declare {name}
       \stms block
 
   -- for x in y ...
@@ -106,6 +107,7 @@ line_compile =
       \append " do"
 
     with @block loop
+      \declare names
       \stms block
 
   export: (node) =>

tests/outputs/lists.lua

@@ -197,8 +197,8 @@ local hello = (function()
   for _index_0 = 1, #_list_1 do
     x = _list_1[_index_0]
     local _list_2 = items
-    for _index_0 = 1, #_list_2 do
+    for _index_1 = 1, #_list_2 do
-      local y = _list_2[_index_0]
+      local y = _list_2[_index_1]
       _len_0 = _len_0 + 1
       _accum_0[_len_0] = x + y
     end