[Fact, WorkItem(59738, "https://github.com/dotnet/roslyn/issues/59738")]
        public void DefiniteAssignmentInReceiverOfExtensionMethodInDelegateCreation()
        {
            var comp = CreateCompilation(@"
using System;
bool b = true;
_ = new Func<string>((b ? M(out var i) : i.ToString()).ExtensionMethod);

string M(out int i)
{
    throw null;
}

static class Extension
{
    public static string ExtensionMethod(this string s) => throw null;
}
	");
            comp.VerifyDiagnostics(
                // (3,6): warning CS0219: The variable 'b' is assigned but its value is never used
                // bool b = true;
                Diagnostic(ErrorCode.WRN_UnreferencedVarAssg, "b").WithArguments("b").WithLocation(3, 6),
                // (4,37): warning CS0168: The variable 'i' is declared but never used
                // _ = new Func<string>((b ? M(out var i) : i.ToString()).ExtensionMethod);
                Diagnostic(ErrorCode.WRN_UnreferencedVar, "i").WithArguments("i").WithLocation(4, 37),
                // (6,8): warning CS8321: The local function 'M' is declared but never used
                // string M(out int i)
                Diagnostic(ErrorCode.WRN_UnreferencedLocalFunction, "M").WithArguments("M").WithLocation(6, 8)
                );
        }