don't use coroutine to yield template code (fixes issue in lapis)

etlua.lua

@@ -204,9 +204,17 @@ do
       if name == nil then
         name = "etlua"
       end
-      local code_fn = coroutine.wrap(function()
+      local code_fn
-        return coroutine.yield(code)
+      do
-      end)
+        local code_ref = code
+        code_fn = function()
+          do
+            local ret = code_ref
+            code_ref = nil
+            return ret
+          end
+        end
+      end
       local fn, err = load(code_fn, name)
       if not (fn) then
         do

etlua.moon

@@ -1,4 +1,4 @@
-VERSION = "1.0.1"
+VERSION = "1.0.2"
 
 import insert, concat from table
 
@@ -163,8 +163,11 @@ class Parser
     "#{err_msg} [#{source_line_no}]: #{source_line}"
 
   load: (code, name="etlua") =>
-    code_fn = coroutine.wrap ->
+    code_fn = do
-      coroutine.yield code
+      code_ref = code
+      ->
+        with ret = code_ref
+          code_ref = nil
 
     fn, err = load code_fn, name