using Qux = Foo.Bar;

public class Foo
{
    public enum Bar
    {
        Baz
    }

    public int Qux { get; set; }

    // Okay, but suggests IDE0002: Simplify member access, see Method2.
    public void Method1(Qux qux = Foo.Bar.Baz)
    {
    }

    // CS1061: 'int' does not contain a definition for 'Baz' and no accessible extension method 'Baz' accepting a first argument of type 'int' could be found (are you missing a using directive or an assembly reference?).
    public void Method2(Qux qux = Qux.Baz)
    {
    }
}