llvm-gcc-4.0/gcc/testsuite/g++.dg/ext/visibility/assign1.C

/* { dg-do compile } */
/* { dg-require-visibility "" } */
/* { dg-final { scan-hidden "_ZN1DaSERKS_" } } */

struct B {
  B& operator=(const B&);
};

struct D : public B {
  // The implicit assignment operator should be hidden.
} __attribute__((visibility("hidden")));

D d1, d2;

void f() {
  d1 = d2;
}