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[SR-3849] Combined class and protocol constraints aren't propagated correctly #46434

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swift-ci opened this issue Feb 3, 2017 · 2 comments
Closed

[SR-3849] Combined class and protocol constraints aren't propagated correctly #46434

swift-ci opened this issue Feb 3, 2017 · 2 comments
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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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@swift-ci
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swift-ci commented Feb 3, 2017

Previous ID SR-3849
Radar rdar://problem/38535743
Original Reporter otbivnoe (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Xcode 8.2.1

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

md5: 8100285ab48c0c97e0d3c3418171fe8c

relates to:

  • SR-3837 init provided by protocol constraint not found when generic func requires subclass

Issue Description:

There is strange generic behaviour:

protocol Textable {}

class Test {
    init<T: NSObject>(values: [T]) where T: Textable {}
}

func test<T: NSObject>(value: T) where T: Textable {
    let values = [value]
    Test(values: [value]) // Cannot convert value of type '[T]' to expected argument type '[_]'
}

But if I write

Test(values: values)

it works fine.

Also the similar problem with this code:

func test<T: NSObject>(ts: [T]) where T: Textable {}

func test<T1: NSObject, T2: NSObject>(t1: T1, t2: T2) where T1: Textable, T2: Textable {
    
    test(ts: [t1, t2]) //Cannot convert value of type '[NSObject]' to expected argument type '[_]'
}
@slavapestov
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@swift-ci create

@slavapestov
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#15489

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