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[SR-14508] Failed to produce diagnostic on accidentally pattern-matching on struct #56860

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typesanitizer opened this issue Apr 19, 2021 · 2 comments
Closed

[SR-14508] Failed to produce diagnostic on accidentally pattern-matching on struct #56860

typesanitizer opened this issue Apr 19, 2021 · 2 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

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@typesanitizer
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Previous ID SR-14508
Radar rdar://problem/76825572
Original Reporter @typesanitizer
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI
Assignee None
Priority Medium

md5: 52d4efe57340bfe4c2ff8f6c45bb7c5f

Issue Description:

import SwiftUI

struct S {}

struct V: View {
  var s: S
  var body: some View {
    switch self.s {
    case .a(_): Text("")
    }
  }
}

This fails to produce a diagnostic on a recent-ish main compiler @ a93593a (Apr 8).
@typesanitizer
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@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@xedin
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xedin commented Jul 13, 2022

Fixed in 5.7:

error: '_' can only appear in a pattern or on the left side of an assignment
    case .a(_): Text("")
            ^
error: type 'S' has no member 'a' 
    switch self.s {
                ^

@xedin xedin closed this as completed Jul 13, 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
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@xedin @typesanitizer