I recently split a combined grammar that I had built into separate parser and lexer grammars. I noticed that in the combined grammar when I attempt to reference an undefined token, Antlr throws an error. However, after I split this grammar into separate lexer and parser grammars, Antlr allowed me to reference lexer tokens in the parser grammar not defined by the lexer grammar. These become very difficult to debug. Am I missing something, or is the the correct behavior? thanks.
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