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[SR-5515] popFirst error message is silly #48087

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mattneub opened this issue Jul 20, 2017 · 3 comments
Open

[SR-5515] popFirst error message is silly #48087

mattneub opened this issue Jul 20, 2017 · 3 comments
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@xedin
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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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@mattneub
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Previous ID SR-5515
Radar None
Original Reporter @mattneub
Type Bug
Environment

Xcode Version 9.0 beta 3 (9M174d)

Additional Detail from JIRA
Votes 2
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee @xedin
Priority Medium

md5: a87fa35be4ed517d2c1b701a237232de

Issue Description:

var arr = [1,2,3]
arr.popFirst()  // cannot use mutating member on immutable value: 'arr' is immutable

That's a silly error message. `arr` is not immutable in any normal sense. The problem is actually that popFirst doesn't operate on an Array at all (something I've always found rather weird, but there it is).
@belkadan
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Yeah, we're looking at this popFirst.

@xedin, any idea what's going on here? And @dabrahams, why doesn't RangeReplaceableCollection have its own popFirst?

@dabrahams
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Pop operations are supposed to be O(1), and many models of RangeReplaceableCollection can't offer that guarantee.

@belkadan
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Ah, of course. Thanks.

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

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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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@dabrahams @belkadan @mattneub