Error when using collection-expression for an array-typed attribute argument.

[CyrusNajmabadi]

    [X([1, 2, 3])]
    class C
    {
    }

    public class XAttribute : System.Attribute
    {
        public XAttribute(int[] values) { }
    }

Error: An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type

This is expected to work, just like with a normal argument. An attribute argument should support target-typing. After all, you can pass null to the argument, and that is totally fine.

Relates to test plan #66418

[RikkiGibson]

Associated PR was merged so closing this out.