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// CS4026: The CallerMemberName applied to parameter `x' will have no effect because it applies to a member that is used in context that do not allow optional arguments
// Line: 14
// Compiler options: -warnaserror
using System.Runtime.CompilerServices;
partial class D
{
partial void Foo (string x = "x");
}
partial class D
{
partial void Foo ([CallerMemberName] string x)
{
}
}