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[SR-3824] Autoclosure attribute fails with type aliased function #46409

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NachoSoto opened this issue Feb 1, 2017 · 3 comments
Closed

[SR-3824] Autoclosure attribute fails with type aliased function #46409

NachoSoto opened this issue Feb 1, 2017 · 3 comments
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@NachoSoto
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis

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@NachoSoto
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Previous ID SR-3824
Radar None
Original Reporter @NachoSoto
Type Bug
Status Resolved
Resolution Duplicate
Environment

Swift version 3.0.2 (swiftlang-800.0.63 clang-800.0.42.1)

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, TypeChecker
Assignee @NachoSoto
Priority Medium

md5: 7f0bd7d9141ff64ce95deaa718e3b627

is duplicated by:

  • SR-2688 autoclosure does not support closure typealias

Issue Description:

class C {
    typealias X = () -> Void

    // error: @autoclosure attribute only applies to function types
    func f1(x: @autoclosure @escaping X) {}

    // works
    func f2(x: @autoclosure @escaping () -> Void) {}
}
@slavapestov
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I think ideally @autoclosure would be stored as an attribute of the parameter, and not on the type itself. There are some other issues where @autoclosure shows up in odd places, eg

func foo(fn: @autoclosure @escaping () -> ()) {
  let f = fn // error: expression type '() -> ()' is ambiguous without more context
  let ff: () -> () = fn // works
}

@swift-ci
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Comment by David Owens (JIRA)

Agree, but this is a duplicate of SR-2688. Been around for a while.

@swift-ci
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Comment by David Owens (JIRA)

Already been tracking for a bit.

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

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself type checker Area → compiler: Semantic analysis
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@slavapestov @NachoSoto @swift-ci