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[SR-13554] Misleading error "cannot assign value of type 'T' to type 'T'" for shadowed generic type #55991

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regexident opened this issue Sep 16, 2020 · 1 comment
Open

[SR-13554] Misleading error "cannot assign value of type 'T' to type 'T'" for shadowed generic type #55991

regexident opened this issue Sep 16, 2020 · 1 comment
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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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@regexident
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Previous ID SR-13554
Radar rdar://problem/68993160
Original Reporter @regexident
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee None
Priority Medium

md5: 905ab060d96abfd26a4e6fec0bd2fd11

Issue Description:

The following code:

struct Foo<T> {
    let t: T
    
    init<T>(t: T) {
        self.t = t
    }
}

… produces the following error:

// error: cannot assign value of type 'T' to type 'T'
//     self.t = t
//          ^
//            as! T

The error message here is bad: It should hint at T being shadowed.

The as! T is also gonna lead to more problems, rather than less. I can count the times that adding a force cast solved a random compilation error on a single hand.
@typesanitizer
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@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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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 type checker Area → compiler: Semantic analysis
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@regexident @typesanitizer