[Issue 11124] support "is (T : struct)" syntax

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11124



--- Comment #2 from Kenji Hara <k.hara.pg at gmail.com> 2013-09-25 09:06:36 PDT ---
(In reply to comment #0)
> Another case where this could be useful, is if T defines an alias this that
> resolves to another type:
> 
> class C
> {
>     T t;
>     alias t this;
> }
> 
> is (T == struct); //false
> is (T : struct); //true

Mistake of:

is (C == struct); //false
is (C : struct); //true

?

And, how this will work when multiple alias this is properly implemented?

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