Is this a bug when creating proxies in classes?

[anonymous via Digitalmars-d-learn]

On Tuesday, 26 August 2014 at 18:13:52 UTC, Gary Willoughby wrote:
> With that in mind what is strange is that if in my example you 
> change the class for a struct everything works as expected. Why 
> is that?

That's because when not mixed into a class, Proxy did import
std.traits:

      static if (!is(typeof(this) == class))
      {
          private import std.traits;