[antlr-interest] Proposal: synpred inversion?

[Sam Harwell]

Currently you can only invert sets in a synpred. It seems like inverting
the entire predicate could be useful. It could be implemented by
backtracking returning state.failed instead of !state.failed, though
putting it in the dfa could be a bit tougher (but doable).

 

I'm particularly interested in an example of how this could encourage
poor grammar design, as that would be a big fault with the idea.

 

Sam

 

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