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[SR-9051] Cannot call a protocol method returning Self in a tuple type on an existential #51554

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hamishknight opened this issue Oct 20, 2018 · 0 comments
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[SR-9051] Cannot call a protocol method returning Self in a tuple type on an existential #51554

hamishknight opened this issue Oct 20, 2018 · 0 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-9051
Radar None
Original Reporter @hamishknight
Type Bug
Status Resolved
Resolution Duplicate
Environment

Swift version 4.2-dev (LLVM c4a0883115, Clang 0a99881462, Swift 533575ab62)
Target: x86_64-apple-darwin17.7.0

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

md5: e59125b45533bbfce9faaa478e0523d2

duplicates:

  • SR-2672 Implement tuple conversion

Issue Description:

The following doesn't compile:

protocol P {}
extension P {
  func foo() -> (Self, String) { return (self, "") }
}

func bar(_ x: P) {
  let y = x.foo() // error: Cannot express tuple conversion '(P, String)' to '(P, String)'
}

However it does compile when foo() returns Self directly:

protocol P {}
extension P {
  func foo() -> Self { return self }
}

func bar(_ x: P) {
  let y = x.foo() // fine.
}
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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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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@hamishknight