Determining whether something is an interface?

[torhu]

Christopher Wright wrote:
> You can determine whether a type is a class:
> is (T : Object)
> 
> There's no equivalent for interfaces. You can use the compiles trait:
> __traits(compiles, class Something : T {})
> Except you can't -- it only takes expressions, not declarations.
> 
> There are traits for abstract classes (interfaces aren't) and final 
> classes; how about something for interfaces? Or should I just start 
> using abstract classes instead?

Doesn't this work?  It's legal syntax, so I suppose it does what you want.

is(foo == interface)