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[SR-13656] Quick Help does not work for closure parameters #56094

pwightman opened this issue Oct 5, 2020 · 2 comments

[SR-13656] Quick Help does not work for closure parameters #56094

pwightman opened this issue Oct 5, 2020 · 2 comments


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@pwightman pwightman commented Oct 5, 2020

Previous ID SR-13656
Radar rdar://problem/69979000
Original Reporter @pwightman
Type Bug
Status Closed
Resolution Invalid

Attachment: Download

Additional Detail from JIRA
Votes 0
Component/s Source Tooling
Labels Bug
Assignee None
Priority Medium

md5: 4a13d4044e7b729d5ac80603e66587ad

Issue Description:

Quick Help in Xcode does not show type information for closure params, but does for usages of the param within the closure body.

Affected Xcode versions: This has been the case since Swift was released AFAIK, I never remember it working, but definitely Xcode 10, 11 & 12.


let _: (Int) -> Void = { num in // <- option-clicking 'num' here does not show type info
    print(num) // <- option-clicking here does show type info

Option-clicking closure params is something I want to do very often, as a means of exploring types of unfamiliar APIs, or to know which order the params come in, e.g. "does [1, 2, 3].enumerated() return (index, num) or (num, index)?"

Workarounds include: using the parameter in the function body and option-clicking, or manually looking up the documentation for the function.




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@typesanitizer typesanitizer commented Oct 6, 2020

@swift-ci create

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@akyrtzi akyrtzi commented Oct 7, 2020

Thanks for reporting this but this is an Xcode-side issue, not Swift tooling one. It would not be fixed with a change in the Swift repository, so a Swift Jira issue is not applicable.

I'd recommend to file a bug report at so you can follow when an Xcode release has this fixed.

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