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[SR-1620] Destructuring nested tuples in closure arguments #44229

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mbrandonw opened this issue May 25, 2016 · 1 comment
Open

[SR-1620] Destructuring nested tuples in closure arguments #44229

mbrandonw opened this issue May 25, 2016 · 1 comment
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@xedin
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself feature A feature request or implementation

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@mbrandonw
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Previous ID SR-1620
Radar rdar://problem/28449788
Original Reporter @mbrandonw
Type Bug
Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, LanguageFeatureRequest
Assignee @xedin
Priority Medium

md5: 0b85283bd463cac1ff681552724c2a42

relates to:

  • SR-2135 Multiple Tuple Parameters to a Closure cannot be Decomposed in the Parameter List
  • SR-4738 Can not decompose nested tuple in closure arguments

Issue Description:

This currently doesn't compile:

[(1, 2), (2, 3), (3, 4)].reduce(0) { (accum, (first, second)) in 
  accum + first + second 
}

Instead one has to do

[(1, 2), (2, 3), (3, 4)].reduce(0) { (accum, firstSecond) in
  accum + firstSecond.0 + firstSecond.1
}

Destructuring of tuples is supported in direct use though:

let (a, (b, c)) = (1, (2, 3))

Should this be supported?
@belkadan
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This would have to go through the Swift Evolution Process.

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

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself feature A feature request or implementation
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@mbrandonw @belkadan