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[SR-1929] @discardableResult is lost after optional chaining. #44538

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swift-ci opened this issue Jun 29, 2016 · 0 comments
Closed

[SR-1929] @discardableResult is lost after optional chaining. #44538

swift-ci opened this issue Jun 29, 2016 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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Previous ID SR-1929
Radar None
Original Reporter andersha (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment

Xcode 8 beta 1

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

md5: b4c9d1a6c3b7ca480359bcfee1d19575

duplicates:

  • SR-1681 spurious "unused result" warning in Swift 3

Issue Description:

class TrashBin {
    @discardableResult
    func empty() -> [Trashable] {
         // ...
    }
}

var myBin: TrashBin? = TrashBin()

/// No warning.
myBin!.empty()

/// Expected: No warnings at all.
/// Actual: Compiler warns unused result.
myBin?.empty()

I am not sure if this is a bug or is intentional, since the SE proposal hasn't not touched on it.
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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