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[SR-7953] Subscript with generic conformance crashes compiler #50488

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iby opened this issue Jun 10, 2018 · 3 comments
Closed

[SR-7953] Subscript with generic conformance crashes compiler #50488

iby opened this issue Jun 10, 2018 · 3 comments
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@iby
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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 type checker Area → compiler: Semantic analysis

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@iby
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iby commented Jun 10, 2018

Previous ID SR-7953
Radar rdar://problem/41027725
Original Reporter @iby
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee @iby
Priority Medium

md5: 57e22cfe0891931312e683b0f1a5eb22

Issue Description:

This fails with an Error🙁25, 18) static member 'foo' cannot be used on protocol metatype '(ParentClass & Proto).Protocol' error:
@belkadan
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No longer crashes in Swift 4.2, but the error message is pretty lousy:

<stdin>:25:16: error: cannot subscript a value of type 'Container' with an index of type '_'
_ = Container()[.foo]
    ~~~~~~~~~~~^~~~~~
<stdin>:15:5: note: found this candidate
    subscript<X: ParentClass & Proto>(x: X) -> Any? {
    ^

@xedin, is there a dup of this?

@xedin
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xedin commented Jun 12, 2018

@swift-ci create

@hborla
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hborla commented Feb 6, 2020

This is resolved in Swift 5.2. The compiler now reports

error: static member 'foo' cannot be used on protocol metatype '(ParentClass & Proto).Protocol'
_ = Container()[.foo]
~~~~~~~~~~~~~~~~~^~~~

Could you please verify using a recent 5.2 snapshot or the latest Xcode beta? Thank you!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@iby iby

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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 type checker Area → compiler: Semantic analysis
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@xedin @belkadan @iby @hborla