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[SR-11041] Generic Extension numeric protocol #53430

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swift-ci opened this issue Jun 28, 2019 · 1 comment
Closed

[SR-11041] Generic Extension numeric protocol #53430

swift-ci opened this issue Jun 28, 2019 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation

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@swift-ci
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Previous ID SR-11041
Radar None
Original Reporter prashantkt (JIRA User)
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI
Assignee None
Priority Medium

md5: 8b65a80ad9449b324d2e7a14bfad7132

Issue Description:

extension Numeric {
  func percentage<T>(of: T) -> T where T.Type == Self.Type {
    return self / of
  }
}

But I get the error

Same-type requirement makes generic parameters 'T' and 'Self' equivalent

However this is working fine

extension Numeric {
    func percentage<Self>(of whole: Self) -> Self {
        return self / whole
    }
}

I don't see any reason why it shouldn't be allowed ?
@belkadan
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That's pretty much what the error message is trying to tell you: you've gained no benefit from using T; just use Self instead. Maybe the compiler can say that more clearly, though. (If it's really smart, it could try to do the replacement for you, but I'm not sure we want to go that far.)

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation
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@belkadan @swift-ci