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[SR-8435] Warn if there's code in a function that takes an uninhabited type #50958

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mdiep opened this issue Aug 1, 2018 · 1 comment
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[SR-8435] Warn if there's code in a function that takes an uninhabited type #50958

mdiep opened this issue Aug 1, 2018 · 1 comment
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@theblixguy
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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 good first issue Good for newcomers

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@mdiep
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mdiep commented Aug 1, 2018

Previous ID SR-8435
Radar None
Original Reporter @mdiep
Type Bug
Status Resolved
Resolution Done
Environment

Swift 4.2

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, StarterBug
Assignee @theblixguy
Priority Medium

md5: 9f25bac15088b532d542ce898612f411

Issue Description:

func f(_: Never) -> Int {
    print("foo")
    return 5
}

`f` cannot be called since `Never` is uninhabited. Swift should warn that the code there will never be executed.
@theblixguy
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@belkadan: PR - #20528

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

Labels
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 good first issue Good for newcomers
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@mdiep @theblixguy