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[SR-7185] Spurious "cast from ... to unrelated type ..." warnings when casting tuples #49733

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hamishknight opened this issue Mar 13, 2018 · 4 comments
Closed

[SR-7185] Spurious "cast from ... to unrelated type ..." warnings when casting tuples #49733

hamishknight opened this issue Mar 13, 2018 · 4 comments
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@slavapestov
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis

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@hamishknight
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Previous ID SR-7185
Radar None
Original Reporter @hamishknight
Type Bug
Status Closed
Resolution Done
Environment

Apple Swift version 4.2-dev (LLVM c4ec2ab808, Clang af436f313e, Swift 347ff6a)
Target: x86_64-apple-darwin17.4.0

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, TypeChecker
Assignee @slavapestov
Priority Medium

md5: ab0425117a1ff6a5b67d32a09389ec50

Issue Description:

The following code raises warnings that the casts will always fail despite them actually succeeding:

protocol P {}
class C {}
class D : C, P {}

let x: (C, C) = (D(), D())

// warning: Cast from '(C, C)' to unrelated type '(P, P)' always fails
print(x is (P, P)) // true

// warning: Cast from '(C, C)' to unrelated type '(P, P)' always fails
print(x as? (P, P) as Any) // Optional((D, D))
@belkadan
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Oof, we have lots of problems with tuples. cc @rudkx, @xedin, @slavapestov

@slavapestov
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I've been collecting spurious cast warning bugs. They're harmless but annoying. I will de-dupe them (and try to fix) at some point.

@LucianoPAlmeida
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Just verify this seems to be fixed on master.
@hamishknight Can you try to verify? 🙂

@hamishknight
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Thanks for checking @LucianoPAlmeida! This appears to have been fixed by #28910

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@slavapestov slavapestov

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis
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4 participants
@slavapestov @belkadan @LucianoPAlmeida @hamishknight