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[SR-6742] IUO Key Path values don't become Optional values #49291

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stephencelis opened this issue Jan 12, 2018 · 1 comment
Open

[SR-6742] IUO Key Path values don't become Optional values #49291

stephencelis opened this issue Jan 12, 2018 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself key paths Feature: key paths (both native and Objective-C) type checker Area → compiler: Semantic analysis

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@stephencelis
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Previous ID SR-6742
Radar None
Original Reporter @stephencelis
Type Bug
Environment

Swift 4.0

Swift 4.1 (2017-12-30 snapshot)

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

md5: fd6833b76a35a6f459f44fe77067ead5

Issue Description:

The following snippet fails to compile:

struct Root {
  let value: String!
}

func a<R>(_ keyPath: KeyPath<R, String?>) -> (String) -> (R) -> R {
  return { _ in
    fatalError()
  }
}

a(\Root.value)

Cannot convert value of type 'KeyPath<Root, String!>' to expected argument type 'KeyPath<_, String?>'

Per a Twitter convo, this is a bug!
@belkadan
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cc @rudkx, @jckarter

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 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 key paths Feature: key paths (both native and Objective-C) type checker Area → compiler: Semantic analysis
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@stephencelis @belkadan