std.traits functions causing the compiler to crash

[Eric]

O
> import std.traits: hasMember;
> interface Xidentity(V, K) if (!hasMember!(V, "x")) {
> }
> class Foo(K): Xidentity!(Foo!K, K) {
>     K x;
> }
> void main() {
>     new Foo!double;
> }
>
>
> I think it contains a loop at the level of types. In theory the 
> compiler should catch them and give a nice error message.
>
> You probably want to use the template constraint syntax, as I 
> have used.

Yes, the template constraint is much better.  However, the 
compiler
still crashes, even with the new code:

import std.traits: hasMember;

interface Identity(V, K) if (!hasMember!(V, "k")) {
}

class Foo(K): Identity!(Foo!K, K) {
     K k;
}

void main() {
     new Foo!double;
}

(dmd7) mrbig:~/tp/d_test2/dlib>dmd Test.d
Segmentation fault (core dumped)


> In D return is not a function, so don't use the ( ).
Yeah, I know.  return returns an expression, and parenthesis
are legal expression syntax:)
-Eric