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[SR-3806] Type checker rejects single defaulted generic argument #46391

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belkadan opened this issue Jan 31, 2017 · 3 comments
Closed

[SR-3806] Type checker rejects single defaulted generic argument #46391

belkadan opened this issue Jan 31, 2017 · 3 comments
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@slavapestov
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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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@belkadan
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Previous ID SR-3806
Radar None
Original Reporter @belkadan
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, TypeChecker
Assignee @slavapestov
Priority Medium

md5: b262e8079c0f5640a45de922083a508c

relates to:

  • SR-3808 SILGen crash with single defaulted generic argument

Issue Description:

public protocol Initializable {
  init()
}
struct GenericBase<T: Initializable> {
  public init(_ value: T = T()) {}
}
struct Reinitializable: Initializable {
  init() {}
}
func test() {
  _ = GenericBase<Reinitializable>()
}

<stdin>:11:35: error: '()' is not convertible to 'Reinitializable'
  _ = GenericBase<Reinitializable>()
                                  ^~

Note that GenericBase<Reinitializable>.init() works fine.
@belkadan
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(and by "works fine" I mean "crashes in SILGen, hopefully soon to be fixed")

@slavapestov
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Interestingly this works in -swift-version 4 mode.

@slavapestov
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Swift 3 mode is gone on master, and this works in Swift 4. Adding a test case in #19162

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

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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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@slavapestov @belkadan