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[SR-13498] Non-descriptive diagnostic when using implicitly unwrapped optional in a tuple #55940

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swift-ci opened this issue Sep 4, 2020 · 3 comments
Open

[SR-13498] Non-descriptive diagnostic when using implicitly unwrapped optional in a tuple #55940

swift-ci opened this issue Sep 4, 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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@swift-ci
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swift-ci commented Sep 4, 2020

Previous ID SR-13498
Radar rdar://problem/68376694
Original Reporter BrAGuS (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee None
Priority Medium

md5: 8630e048f85585fc6b8460a87f9a3846

Issue Description:

Hi

Why I can't use the unwrapped optional string in tuples?(

typealias studentTuple = (name: String!, vechNumber: String?, mark: Int?)

I have error "Using "!" is not allowed here"
@typesanitizer
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Implicitly unwrapped optionals are not a first-class type, they are only permitted in certain places. That said, we could improve the diagnostic here (maybe point you to some documentation which describes the places they are allowed?).

@typesanitizer
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@swift-ci create

@typesanitizer
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You might also want to see https://github.com/apple/swift-evolution/blob/master/proposals/0054-abolish-iuo.md

@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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