dotnet/roslyn
Vedi su GitHubUnexpected diagnostic in `with` expression with indexer on a struct
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#81.666 aperta il 12 dic 2025
Area-CompilersConcept-Diagnostic Clarityhelp wanted
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Descrizione
Although this is an error scenario, the first diagnostic is unexpected.
[Fact]
public void TODO2()
{
var src = """
var c = new S() with { [0] = 1 };
public struct S
{
public int this[int i] { set { } }
}
""";
CreateCompilation(src).VerifyEmitDiagnostics(
// (1,24): error CS0131: The left-hand side of an assignment must be a variable, property or indexer
// var c = new S() with { [0] = 1 };
Diagnostic(ErrorCode.ERR_AssgLvalueExpected, "[0]").WithLocation(1, 24),
// (1,24): error CS0747: Invalid initializer member declarator
// var c = new S() with { [0] = 1 };
Diagnostic(ErrorCode.ERR_InvalidInitializerElementInitializer, "[0] = 1").WithLocation(1, 24));
}