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[SR-8383] Can't infer Root type of key path expression for PartialKeyPath parameter #50910

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natecook1000 opened this issue Jul 26, 2018 · 9 comments
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[SR-8383] Can't infer Root type of key path expression for PartialKeyPath parameter #50910

natecook1000 opened this issue Jul 26, 2018 · 9 comments
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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)

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@natecook1000
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Previous ID SR-8383
Radar rdar://problem/42737031
Original Reporter @natecook1000
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 4
Component/s Compiler
Labels Bug, KeyPaths
Assignee None
Priority Medium

md5: 5c1aa5f3211b0a576cba0956635705a1

duplicates:

  • SR-5667 Type inference for Swift 4 KeyPaths fails within collections

Issue Description:

I get an ambiguity error for the function with a PartialKeyPath parameter in this example:

struct Bar {
  var baz: Int
}

func full<T>(_ k: KeyPath<Bar, T>) {}
full(\.baz) // ok

func partial(_ k: PartialKeyPath<Bar>) {}
partial(\.baz) // error: type of expression is ambiguous without more context
@belkadan
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cc @jckarter, @rudkx

@belkadan
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Oh, is this the same as SR-8382?

@jckarter
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Yeah, I think @mdiep might've fixed this on master recently.

@jckarter
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This particular case still fails, though, so it might be a different issue.

@jckarter
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@swift-ci create

@swift-ci
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Comment by Vatsal Manot (JIRA)

I can replicate this on Xcode 12b4.

@swift-ci
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Comment by Caleb Friden (JIRA)

Just ran into this issue on Xcode 12.1 release.

@swift-ci
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swift-ci commented May 7, 2021

Comment by Basem Emara (JIRA)

Still an issue with Xcode 12.5 / Swift 5.4. Please include a fix in Swift 6 ⚑

@StevenSorial
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Works in Swift 5.6

Probably fixed in #37679

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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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)
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@jckarter @belkadan @natecook1000 @swift-ci @StevenSorial