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Fix a pair of crashes with '@unknown' #15889

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merged 2 commits into from Apr 17, 2018
Merged

Fix a pair of crashes with '@unknown' #15889

merged 2 commits into from Apr 17, 2018

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jrose-apple
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Fixes a pair of issues @rintaro caught around misuse of @unknown default. Let's not crash on bad user input!

SR-7408, SR-7409

@jrose-apple
Don't crash when using @unknown default with a non-enum type.
a9f26ab 
Also improve the error message when using it with a very large space.

https://bugs.swift.org/browse/SR-7408
@jrose-apple
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@swift-ci Please smoke test

rintaro
rintaro approved these changes Apr 12, 2018
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@rintaro rintaro left a comment •
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Diagnostics look great. Thank you!

@CodaFi
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CodaFi commented Apr 12, 2018 •
edited

If @unknown is a structural feature, I think it ought to go into the type checker proper before we enter the exhaustiveness checker. That'll let you keep your assertion.

@jrose-apple
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Yeah, I forgot about limitedChecking when I wrote this. The first commit is probably still valuable, but the second should just be caught earlier.

@jrose-apple
Limit exhaustivity checking when weird things happen with '@unknown'
8157e80 
If someone uses it twice, or on a non-final case, or tries to use it
with a multiple-pattern case, don't bother checking the exhaustiveness
of the switch. (For other violations, the pattern or where-clause is
ignored.)

https://bugs.swift.org/browse/SR-7409
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New version of the second commit (SR-7409).

@swift-ci Please test

@jrose-apple
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@swift-ci Please test source compatibility

@jrose-apple
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Snuck in another PrettyStackTrace too.

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Build failed
Swift Test OS X Platform
Git Sha - 217dbc465965acc9a40f41daa04d8651aaceebd2

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Build failed
Swift Test Linux Platform
Git Sha - 217dbc465965acc9a40f41daa04d8651aaceebd2

@jrose-apple
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@swift-ci Please test source compatibility

@jrose-apple jrose-apple merged commit 275e101 into apple:master Apr 17, 2018
@jrose-apple jrose-apple deleted the ready-for-the-unknown branch April 17, 2018 17:18
This was referenced Apr 12, 2018
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@rintaro rintaro rintaro approved these changes

@xedin xedin Awaiting requested review from xedin

@CodaFi CodaFi Awaiting requested review from CodaFi

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@jrose-apple @CodaFi @swift-ci @rintaro