8000 Failed to produce diagnostic for expression with misplaced '?' · Issue #81710 · swiftlang/swift · GitHub
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Failed to produce diagnostic for expression with misplaced '?' #81710

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Zim999 opened this issue May 22, 2025 · 0 comments
Open

Failed to produce diagnostic for expression with misplaced '?' #81710

Zim999 opened this issue May 22, 2025 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. triage needed This issue needs more specific labels

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@Zim999
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Zim999 commented May 22, 2025

Description

The included simple code produces the "Failed to produce diagnostic for expression" error on compilation.

The issue is the extraneous '?' in the reference to action. The compiler should be able to deal with this and highlight the actual issue.

Reproduction

import SwiftUI

struct InnerView: View {
    var action:  () -> Void
    
    var body: some View {
        Button("Hello", action: action?)
    }
}

This code can be built in an Xcode playground, or by putting it in a file and compiling with swiftc

Expected behavior

The compiler should highlight the actual issue, which is the extraneous '?' in the reference to action

Environment

swift-driver version: 1.120.5 Apple Swift version 6.1.2 (swiftlang-6.1.2.1.2 clang-1700.0.13.5)
Target: arm64-apple-macosx15.0

Additional information

No response
@Zim999 Zim999 added bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. triage needed This issue needs more specific labels labels May 22, 2025
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