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[SR-12988] Failure to dispatch to class var from protocol extension #55434

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dabrahams opened this issue Jun 12, 2020 · 0 comments
Open

[SR-12988] Failure to dispatch to class var from protocol extension #55434

dabrahams opened this issue Jun 12, 2020 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@dabrahams
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Previous ID SR-12988
Radar None
Original Reporter @dabrahams
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: eb2d1be06f9d3ce446d3e615acaf60f7

Issue Description:

This crashes, but shouldn't, with

Apple Swift version 5.2.4 (swiftlang-1103.0.32.9 clang-1103.0.32.53)
Target: x86_64-apple-darwin19.5.0

protocol P {}

open class Base: P {
  class var elementType: Any.Type { fatalError("implement me") }
}

extension Base {
  func access1() { print(Self.elementType) }
}

extension P where Self: Base {
  func access2() { print(Self.elementType) }
}

extension Base {
  final func f() {
    print(Self.elementType) // OK
    access1() // OK
    access2() // trap
  }
}

final class Derived<T>:  Base {
  override class var elementType: Any.Type { T.self }
  func g() { f() }
}

Derived<Int>().g()
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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