The following test case:
----
class HomeController {
    static if (false) {
        mixin(q{ int a; });
    }
    void foo() {
        foreach (m; __traits(derivedMembers, HomeController)) {
        }
    }
}
----
Gives the error:
----
dmd: dsymbol.c:1052: static int ScopeDsymbol::foreach(Dsymbols*, int (*)(void*, size_t, Dsymbol*), void*, size_t*): Assertion `members' failed.
----
On ubuntu 32 and a similar error:
----
Assertion failed: (members), function foreach, file dsymbol.c, line 1052.
----
On OS X 32 and 64.

This worked as expected in dmd 2.056.