CallerMemberName not working with lambda default values?

[marius-bughiu]

Was playing with the default values feature for lambdas, and noticed CallerMemberName is not working. Is it a bug, or a preview limitation?

Can be tested easily with this:

using System.Runtime.CompilerServices;

var myMethod1 = ([CallerMemberName] string? param = null) => Console.WriteLine(param);
void myMethod2([CallerMemberName] string? param = null) => Console.WriteLine(param);

myMethod1();
myMethod2();

The call to myMethod1 doesn't output anything.
The call to myMethod2 correctly outputs <Main>$.

Thoughts?

[CyrusNajmabadi]

This is by design. The delegates created are System.Func and Action, nether of which have that attribute on them.

Use a custom delegate type with that attribute of if you want this behavior. Thanks!