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Completely to my surprise, found that fixing all those sequence issues
revealed that the pattern matcher can catch a lot more inexhaustive
cases than it has been catching. Fixed most of the inexhaustive matches
in the compiler, which had become a bit warnier. No review.
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Improves exhaustiveness analysis to not warn about types which cannot
match due to nonconformant type parameters. Also, look at the different
warnings emitted in the test case based on the presence of a constraint.
Nifty! Closes #3683, no review.
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Massively simplified the exhaustiveness checker with no measurable loss
of fidelity. I might be the only one who can be unsurprised by such a
bloody diff: anyone else would rightly say "how on earth..." No review.
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