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Asked: 2026-05-31T23:47:15+00:00

I am using Happy to generate a parser. I have found that when I

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I am using Happy to generate a parser.

I have found that when I give it tokens which match part of the grammar at a lower level than the top level (such as giving it an expression on it’s own, that isn’t part of a statement), I get an “Internal Happy Error” rather than a parse error.

Is there a way to override notHappyAtAll so that I can print a better error message than “Internal Happy Error”? Obviously other than changing the auto-generated parser file as I’d have to do it every time I updated the grammar.

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1 Answer

  1. Editorial Team

    This problem appears to have been fixed in Happy 1.18.7.

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