parrt/antlr4 — pull request #60 by sharwell (2012-04-03 21:45:58+00:00)
Title: Tool warning for implicitly defined tokens

The tool creates a new implicitly-defined token when a parser rule contains a `TOKEN_REF` to a previously unknown token. This situation indicates a probable misspelling, since the intended token would have been declared in a lexer, imported grammar, or in the `tokens{}` block in the parser header. This change emits new warning 125 when this occurs.