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[SR-6910] Swift 4.1: Dictionary<HashableType1, HashableType2> is not Hashable #49459

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NachoSoto opened this issue Feb 2, 2018 · 3 comments
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[SR-6910] Swift 4.1: Dictionary<HashableType1, HashableType2> is not Hashable #49459

NachoSoto opened this issue Feb 2, 2018 · 3 comments
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@lorentey
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella

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@NachoSoto
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Previous ID SR-6910
Radar rdar://problem/38970262
Original Reporter @NachoSoto
Type Bug
Status Resolved
Resolution Done
Environment

Swift version 4.1 (swiftlang-902.0.34 clang-902.0.30)

Additional Detail from JIRA
Votes 0
Component/s Compiler, Standard Library
Labels Bug
Assignee @lorentey
Priority Medium

md5: 90d47260fa73af573e9d156feeab6a94

Issue Description:

Because of SR-6801, I spent an hour trying to understand why my type would not get automatic synthesis of Hashable. I narrowed it down to this:

func f<T: Hashable>(_ t: T) {}
let a: [String: String] = [:]

f(a)
Equatable.swift:4:3: error: argument type '[String : String]' does not conform to expected type 'Hashable'
f(a)
  ^
@NachoSoto
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Oooh @jckarter points out that this is still WIP: #14247

@lorentey
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@swift-ci create

@lorentey
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SE-0143 has been amended to explicitly allow Hashable conformances for Optional, Array, ContiguousArray, ArraySlice, Dictionary, Range, and ClosedRange.

We've implemented these changes in PR #15382; it has now landed on the master branch.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@lorentey lorentey

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella
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@lorentey @NachoSoto