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[SR-13856] Compiler gets stuck trying to compile undefined keypath subscript access #56254

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robinkunde opened this issue Nov 13, 2020 · 4 comments
Closed

[SR-13856] Compiler gets stuck trying to compile undefined keypath subscript access #56254

robinkunde opened this issue Nov 13, 2020 · 4 comments
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@robinkunde
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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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@robinkunde
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Previous ID SR-13856
Radar rdar://problem/71383770
Original Reporter @robinkunde
Type Bug
Status Closed
Resolution Done

Attachment: Download

Environment

Xcode 12.2

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

md5: cc51a108530546b4e5689333b80bd7f0

Issue Description:

Overview: SwiftyUserDefaults offers a convenient interface for type safe access to user defaults. It allows access through type-checked keys using keypaths as well as @dynamicMemberLookup. The problem occurs when trying to use an undefined keypath.

I tried to reduce the example code as much as possible.

Reproduction steps:

  1. Open example project, open `SwiftCompilerBugExample/Bug.swift`

  2. Build SwiftyUserDefaults target with My Mac

  3. Build completes in several seconds

  4. Uncomment one of the problematic statements in `Bug.swift`

  5. Try building again

  6. Build does not complete in reasonable time
@beccadax
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@swift-ci create

@xedin
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xedin commented Dec 15, 2020

Fixed by #35089 @robinkunde please use the next available main branch snapshot to verify and close this issue.

@robinkunde
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@xedin I tested with the 12/20 snapshot and can confirm the issue is fixed.

@xedin
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xedin commented Dec 29, 2020

Thank you for confirming!

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

Labels
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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@xedin @beccadax @robinkunde