clang-tests/gcc-4_2-testsuite/src/g++.dg/lookup/crash3.C

// { dg-do compile }
// Contributed by Wolfgang Wieser <wwieser at gmx dot de>
// PR c++/15967: ICE with ambiguous operator new

typedef __SIZE_TYPE__ size_t; 

struct A { void *operator new(size_t s){} };  // { dg-error "member found" }
struct B { void *operator new(size_t s){} };  // { dg-error "member found" }

struct C : A,B {}; 

int crash() 
{
  C *c=new C();   // { dg-error "multiple base classes" }
}