Jordan Rose d36a7393b0 Fix issue with expression patterns in switch exhaustivity checking (#23804) ...

Expression patterns (and cast patterns) don't actually contribute to
the exhaustivity of a switch statement---if you're matching against a
String, matching "abc" doesn't meaningfully reduce the full space of
the values you have to match. This was already handled, but didn't do
the right thing in a particular case involving a tuple payload in an
enum after the Space Engine (exhaustivity checker) optimizations that
went out in Swift 5.

https://bugs.swift.org/browse/SR-10301

2019-04-05 09:14:54 -07:00

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