Matching look-ahead xxx cannot start with yyy

Messages > Matching look-ahead xxx cannot start with yyy

This message appears if a look-ahead was successful but the token, by which it started, is not contained int the first set of the IF-branch. This can be the case, when a token has been recognized in the main parser, which  is not contained in the first set of the IF-branch, but the same text is nevertheless recognized from other tokens in the look-ahead.

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