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[SR-11438] Incorrect ambiguity with subscript overloads and partial key path inference #53839

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hamishknight opened this issue Sep 9, 2019 · 1 comment
Closed

[SR-11438] Incorrect ambiguity with subscript overloads and partial key path inference #53839

hamishknight opened this issue Sep 9, 2019 · 1 comment
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@hamishknight
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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-11438
Radar None
Original Reporter @hamishknight
Type Bug
Status Closed
Resolution Done
Environment

Swift version 5.1-dev (LLVM c5340df2d1, Swift 922352a293)
Target: x86_64-apple-darwin18.5.0

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

md5: 52cd65ac4be9533d42af3fe3398c7d0d

Issue Description:

The following incorrectly yields an ambiguity error:

struct S {
  subscript(x: Int) -> Int { x }
  subscript(y y: Int) -> Int { y }
}

let kp: PartialKeyPath<S> = \.[5] // error: Ambiguous reference to member 'subscript'

But arguably it should be unambiguous because there's only one valid candidate that doesn't have an argument label.
@hamishknight
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Fixed by #27102

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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@hamishknight hamishknight

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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