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Check for uninhabited types in sub-patterns (rust-lang#12609)
This alters the exhaustiveness-checking algorithm for pattern matches to avoid raising spurious errors about cases not being covered for uninhabited types. Specifically, the construct_witness function now returns an Option. If it sees that DUMMY_WILD_PAT is being used to match on an uninhabited type it returns None to indicate that there is no witness. We look for DUMMY_WILD_PAT specifically and not any wildcard pattern so that wildcard patterns explicitly written by the programmer continue to work without raising errors about unreachability.
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