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[SR-11392] Failed to produce diagnostic when using protocol conforming with extension #53793

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kateinoigakukun opened this issue Aug 29, 2019 · 3 comments
Closed

[SR-11392] Failed to produce diagnostic when using protocol conforming with extension #53793

kateinoigakukun opened this issue Aug 29, 2019 · 3 comments
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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 failed to produce diagnostic Bug → internal error: Failed to produce diagnostic for expression type checker Area → compiler: Semantic analysis

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@kateinoigakukun
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Previous ID SR-11392
Radar rdar://problem/54839571
Original Reporter @kateinoigakukun
Type Bug
Status Resolved
Resolution Done
Environment

Swift version 5.1-dev (LLVM c5340df2d1, Swift 84f625f)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, TypeChecker
Assignee None
Priority Medium

md5: ca664a5aaaec260a347e8a088858fa02

Issue Description:

protocol P1 {
    associatedtype X
    associatedtype A: P2 where A.X == X
}

protocol P2 {
    associatedtype X
}

struct S {}

extension S {
    struct A: P2 {
        typealias X = Int
    }
}


extension S: P1 {}

print(S.X.self)

This results

 error: failed to produce diagnostic for expression; please file a bug report
@belkadan
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@swift-ci create

@CodaFi
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CodaFi commented Oct 21, 2019

Godbolt sez 4.2 was the last time we gave a diagnostic here

source>:21:9: error: reference to invalid associated type 'X' of type 'S'
print(S.X.self)
        ^
<source>:19:1: error: type 'S' does not conform to protocol 'P1'
extension S: P1 {}
^
<source>:2:20: note: protocol requires nested type 'X'; do you want to add it?
    associatedtype X
                   ^

@slavapestov
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#28157

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added failed to produce diagnostic Bug → internal error: Failed to produce diagnostic for expression diagnostics QoI Bug: Diagnostics Quality of Implementation labels Dec 22, 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 diagnostics QoI Bug: Diagnostics Quality of Implementation failed to produce diagnostic Bug → internal error: Failed to produce diagnostic for expression type checker Area → compiler: Semantic analysis
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@slavapestov @belkadan @CodaFi @kateinoigakukun @AnthonyLatsis