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[SR-9898] Non-requirement static members should be usable on protocol metatype #52304

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dabrahams opened this issue Feb 10, 2019 · 1 comment
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[SR-9898] Non-requirement static members should be usable on protocol metatype #52304

dabrahams opened this issue Feb 10, 2019 · 1 comment
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compiler The Swift compiler in itself improvement

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@dabrahams
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Previous ID SR-9898
Radar None
Original Reporter @dabrahams
Type Improvement
Status Resolved
Resolution Invalid
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement
Assignee None
Priority Medium

md5: 7980cf230b8fad159efd1c9f32b104c7

Issue Description:

Seems to me there's no reason this shouldn't compile. Am I missing something?

protocol P {}
struct Q : P { }

extension P { 
    // Not implementing a requirement 
    static var x: P { return Q() }
}

func f(_ : P) {}
f(.x) // error: static member 'x' cannot be used on protocol metatype 'P.Protocol'
@belkadan
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The compiler can't tell from the call site that the implementation of x doesn't contain something like print(self).

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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compiler The Swift compiler in itself improvement
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@dabrahams @belkadan