The assertion fails in the following program (I was able to fix it in my back-end for .NET but it is probably best for a fix to go into the front-end).

struct X {
     int i;
     this(this) {
         ++i;
     }
}
void main() {
     X [1] xs;
     xs[0] = X();
     foreach(x; xs) {
         assert(x.i == 1);
     }
}