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Chandler Carruth
1b2eb42c5a
An invalid parse due to an error token isn't likely a great diagnostic as it will already have been diagnosed by the lexer. A common case to start handling that is when the parser encounters an invalid token when expecting an expression. This removes a number of unhelpful diagnostics after the lexer has done a good job diagnosing. This also means that there may be parse tree errors that aren't diagnosed when there are lexer-diagnosed errors, so track that. Follow-up to #4430 that almost finishes addressing its diagnostic TODO.