Removed insufficient fix for DMD bug 1161, it was causing problems with instantiating imported templates, and passing private variables as aliases. I failed to come up with a proper fix!

module union1;

union U
{
    float f;
    int i;
}

void main()
{
    float f = 2;
    U u = U(f);
    assert(u.i == *cast(int*)&f);
}