george.burgess.iv added a comment.
> C89 has no bool type and no stdbool.h but it has been added to later
> standards? That means the generalization could theoretically be done for
> later C standards, because we could check if the bool typedef had been used?
> If yes, would the check benefit?
Sure, and we do complain about `x == -1` if the type of `x` is `_Bool`, but the
type of `x == y` appears to be an `int` in all of {c89, c99, c11}:
https://godbolt.org/g/BciGZT :)
https://reviews.llvm.org/D45059
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