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[SR-2201] posible @autoclosure regression; type inference #44808

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swift-ci opened this issue Jul 28, 2016 · 3 comments
Closed

[SR-2201] posible @autoclosure regression; type inference #44808

swift-ci opened this issue Jul 28, 2016 · 3 comments
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@rudkx
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself regression swift 3.0 type checker Area → compiler: Semantic analysis

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@swift-ci
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swift-ci commented Jul 28, 2016 •
edited by AnthonyLatsis

Previous ID SR-2201
Radar rdar://problem/27594604
Original Reporter aventurella (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Swift Ver. 3.0 (Jun 20, 2016)
x86_64-ubuntu-linux-gnu

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, 3.0Regression, TypeChecker
Assignee @rudkx
Priority Medium

md5: c849b311738fb0ec6e7a8f67591775d7

Issue Description:

With swift 2.1 and 2.2 the following compiles successfully:

// action 1
func action<Result>(name: String, @autoclosure(escaping) value: () -> Result){}

// action 2
func action<Result, A1, A2>(name: String, callback: (A1, A2) -> Result){}


action("doStuff"){
    (arg0: String, arg1: String) -> String in
    return "bar"
}

The compiler properly infers the proper action function to be invoked, in this case // action 2 which requires the callback (A1, A2) -> Result

Under Swift 3.0 however:

// action 1
func action<Result>(_ name: String, value: @autoclosure(escaping) () -> Result){}

// action 2
func action<Result, A1, A2>(_ name: String, callback: (A1, A2) -> Result){}


action("doStuff"){
    (arg0: String, arg1: String) -> String in
    return "bar"
}

The compiler seems to decide // action 1 is the proper function to invoke and compilation fails with the following error:

ambiguous use of 'action(_:value:)'

It seems to consider:

action("doStuff"){
    (arg0: String, arg1: String) -> String in
    return "bar"
}

to be:

action("doStuff", value: () -> ((String, String) -> String))
@belkadan
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cc @rudkx

@Dante-Broggi
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This seems fixed by the Xcode 9.4.1 toolchain. If so, it should be closed.

@Dante-Broggi
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Resolving as the provided code compiles for me, and no one has responded since I asked.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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@rudkx rudkx

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself regression swift 3.0 type checker Area → compiler: Semantic analysis
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@belkadan @swift-ci @AnthonyLatsis @Dante-Broggi