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[SR-6305] Cannot initialise Dictionary from an EnumeratedSequence #48855

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karwa opened this issue Nov 6, 2017 · 4 comments
Open

[SR-6305] Cannot initialise Dictionary from an EnumeratedSequence #48855

karwa opened this issue Nov 6, 2017 · 4 comments

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@karwa
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karwa commented Nov 6, 2017

Previous ID SR-6305
Radar rdar://problem/37159993
Original Reporter @karwa
Type Bug
Environment

Apple Swift version 4.0.3 (swiftlang-900.0.71 clang-900.0.38)

Target: x86_64-apple-macosx10.9

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, TypeChecker
Assignee @xedin
Priority Medium

md5: a219796b79b304ec98d478ac6a4adc11

is duplicated by:

  • SR-6905 Dictionary(uniqueKeysWithValues:) does not accept sequence of labeled tuples

Issue Description:

The following snippet fails to compile:

let test = Dictionary(uniqueKeysWithValues: ["a", "b", "c"].enumerated())

With the message:

Cannot invoke initializer for type 'Dictionary<_, _>' with an argument list of type '(uniqueKeysWithValues: EnumeratedSequence<[String]>)'

The only way I was able to get it to work was to add a pass-through call to "map" on the end:

let test = Dictionary(uniqueKeysWithValues: ["a", "b", "c"].enumerated().map { $0 })
@belkadan
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belkadan commented Nov 6, 2017

cc @xedin

@belkadan
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belkadan commented Nov 6, 2017

(thanks, Karl!)

@belkadan
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belkadan commented Feb 2, 2018

@swift-ci create

@swift-ci
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swift-ci commented Aug 16, 2018

Comment by Manuel Martín Benítez (JIRA)

You are just passing a Sequence to the initializer with the keys, and it needs a sequence with key-value pairs.

let test = Dictionary(uniqueKeysWithValues: zip(["a", "b", "c"], [1, 2, 3]))

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