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[SR-949] Warn when Self is being redefined as generic #43561

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swift-ci opened this issue Mar 15, 2016 · 0 comments
Open

[SR-949] Warn when Self is being redefined as generic #43561

swift-ci opened this issue Mar 15, 2016 · 0 comments
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compiler The Swift compiler itself improvement type checker Area → compiler: Semantic analysis

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Previous ID SR-949
Radar None
Original Reporter inket (JIRA User)
Type Improvement
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, TypeChecker
Assignee None
Priority Medium

md5: 968191e4dedab2396616e09ddaceb135

Issue Description:

Right now, it is impossible to restrict a protocol to a subclass of a specific class.

class Superclass {}
protocol Test {
    func f<Self: Superclass>(param: Self)
}

Trying to do so will appear to work, but in reality is a redefinition of Self which the compiler doesn't warn about.

Adding a warning would help developers determine what is actually happening in this case.
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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compiler The Swift compiler itself improvement type checker Area → compiler: Semantic analysis
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