Failed to produce diagnostic for expression

[wtholliday]

Description

Reproduction

import SwiftUI

class ReferenceToolViewModel {

}

extension ReferenceToolViewModel: DropDelegate {
    func performDrop(info: DropInfo) -> Bool {
        true
    }
}

struct ReferenceToolView: View {

    @State var model: ReferenceToolViewModel

    var body: some View {
        Text("Drop an image here")
            .onDrop(of: [Image.self], delegate: model)
    }
}

Expected behavior

Informative error message

Environment

swift-driver version: 1.115.1 Apple Swift version 6.0.3 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)
Target: arm64-apple-macosx15.0

Additional information

No response