More robust scanning

error_handling.lua

@@ -133,6 +133,9 @@ enhance_error = function(error_message)
             end
             local scan
             scan = function(t, is_lua_id)
+              if not (t) then
+                return 
+              end
               for k, v in pairs(t) do
                 if type(k) == 'string' and type(v) == 'function' then
                   if not (is_lua_id) then

error_handling.moon

@@ -106,6 +106,7 @@ enhance_error = (error_message)->
 
             -- Globals and global compile rules:
             scan = (t, is_lua_id)->
+                return unless t
                 for k,v in pairs(t)
                     if type(k) == 'string' and type(v) == 'function'
                         k = k\from_lua_id! unless is_lua_id