// PR c++/13009// { dg-do run }struct A {  char a;};struct B: public virtual A {  #if 0 // this piece of code works around the problem  B& operator= (const B& other)  {    A::operator= (other);  }  #endif};struct C: public B {  char c;};int main() {  B b;  b.a = 'b';  C c;  c.a = c.c = 'c';    c.B::operator= (b);  if (c.a != 'b' || c.c != 'c')    return 1;}