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Rollup merge of #65880 - Nadrieril:gather-usefulness-tests, r=varkor
Gather together usefulness tests I took most tests that were testing only for match exhaustiveness, pattern refutability or match arm reachability, and put them in the same test folder. I found it helpful to have them all in the same place when working on the usefulness algorithm.
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src/librustc_mir/hair/pattern/_match.rs

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/// Note: most tests relevant to this file can be found (at the time of writing)
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/// in src/tests/ui/pattern/usefulness.
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///
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/// This file includes the logic for exhaustiveness and usefulness checking for
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/// pattern-matching. Specifically, given a list of patterns for a type, we can
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/// tell whether:

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