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[SR-13088] False positive warning "cast always fails" #55534

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typesanitizer opened this issue Jun 26, 2020 · 3 comments
Closed

[SR-13088] False positive warning "cast always fails" #55534

typesanitizer opened this issue Jun 26, 2020 · 3 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis

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@typesanitizer
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Previous ID SR-13088
Radar rdar://61607790
Original Reporter @typesanitizer
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee None
Priority Medium

md5: c179929406293501a8ea74b137098356

Sub-Tasks:

  • SR-11434 False positive warning: cast always fails from 'Encodable' to 'NSDecimalNumber'/'[String: Encodable]'
  • SR-12321 False positive warning: cast always fails from 'Encodable' to '[String: Encodable]'
  • SR-13025 False positive warning: cast always fails from '(AnyEvent, AnyC)' to 'Container'
  • SR-13081 False positive warning: cast always fails from 'JSON' to '[Any]'
  • SR-13035 False positive warning: cast always fails from 'Result<String, ChildError1>' to 'Result<String, SomeError>'
  • SR-7187 False positive warning: cast always fails from '[Any]' to '[String?]'
  • SR-6192 Spurious "Cast from ... to unrelated type ... always fails" warning when implicitly converting an empty collection

Issue Description:

This is an umbrella JIRA for several other JIRAs.

  1. https://bugs.swift.org/browse/SR-11434

  2. https://bugs.swift.org/browse/SR-12321

  3. https://bugs.swift.org/browse/SR-13025

  4. https://bugs.swift.org/browse/SR-13035

  5. https://bugs.swift.org/browse/SR-13081

  6. https://bugs.swift.org/browse/SR-7187

  7. https://bugs.swift.org/browse/SR-6192
@typesanitizer
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Ping @LucianoPAlmeida: you might want to look at all of these together before starting to tackle SR-13081 which you signed up for. 🙂

@LucianoPAlmeida
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theindigamer (JIRA User) Sure, I'll look it up 🙂
Also, I believe that SR-7187 could be grouped here too. In fact, maybe is a dupe of the JSON to '[Any]' can we add here?

@typesanitizer
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Thanks, I missed that one. It's not super clear whether SR-7187 is a dupe, as one of the comment notes that it only happens when optionals are involved. So I've added it as a sub-task for now.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis
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@typesanitizer @LucianoPAlmeida