implemented delegators and improved the error messages of unmatched type classes

tests/reject/topaque.nim

@@ -1,18 +1,18 @@
 discard """
   file: "topaque.nim"
   line: 16
-  errormsg: "undeclared field: \'buffer\'"
+  errormsg: "undeclared identifier: \'buffer\'"
 """
-# Test the new opaque types
-
-import 
-  mopaque
-  
-var
-  L: TLexer
-  
-L.filename = "ha"
-L.line = 34
-L.buffer[0] = '\0' #ERROR_MSG undeclared field: 'buffer'
+# Test the new opaque types
+
+import 
+  mopaque
+  
+var
+  L: TLexer
+  
+L.filename = "ha"
+L.line = 34
+L.buffer[0] = '\0' #ERROR_MSG undeclared field: 'buffer'