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[SR-15281] [Sema] Couple of contextual mismatch and runtime cast diagnostic fixes #39648

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Merged
merged 4 commits into from
Oct 10, 2021
Merged

[SR-15281] [Sema] Couple of contextual mismatch and runtime cast diagnostic fixes #39648

merged 4 commits into from
Oct 10, 2021

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LucianoPAlmeida
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This is twofold:
First commit is taking into account value-to-optional restrictions for an extra layer of optionality when recording the fix,
because otherwise we would compute the same type conversion.

  var b1: B {
    a.flatMap(B.init(a:)) as! B 
   // flatMap opens a type variable for generic parameter as result `T?` with a layer of optionality that we were not 
   // considering so fix was considering only `B` as! `B` which lead to misleading diagnostic reported.
  }

Second commit: Instead of suggesting a ' as! B' fix-it on B? to B contextual mismatch, if we know from type has a subtype relation with to type, it would make more sense to suggest a force unwrap "!".

Resolves SR-15281.

@LucianoPAlmeida LucianoPAlmeida requested a review from xedin October 8, 2021 02:48
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@swift-ci Please smoke test

@LucianoPAlmeida
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@swift-ci Please smoke test MacOS Platform

xedin
xedin approved these changes Oct 8, 2021
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Looks good! Left a couple of minor comments inline.

@LucianoPAlmeida LucianoPAlmeida requested a review from xedin October 9, 2021 16:57
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@swift-ci Please smoke test

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@swift-ci Please test Windows Platform

@LucianoPAlmeida LucianoPAlmeida merged commit ca8b660 into swiftlang:main Oct 10, 2021
@LucianoPAlmeida LucianoPAlmeida deleted the SR-15281-cast branch October 10, 2021 11:03
@LucianoPAlmeida LucianoPAlmeida mentioned this pull request Mar 27, 2022
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@LucianoPAlmeida LucianoPAlmeida mentioned this pull request Oct 10, 2021
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@xedin xedin xedin approved these changes

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@LucianoPAlmeida @xedin