The follow code incorrectly fails to compile with G++ 2.96-78:

#include <string>

struct AStruct
{
   union {
      int a;
   };
   std::string str;
};

AStruct global;

void Foo (const AStruct & other)
{
   global = other;
}

The error is:

temp.cc: In method `AStruct &AStruct::operator= (const AStruct &)':
temp.cc:7: `AStruct::{anonymous union} &AStruct::{anonymous
union}::operator= (const AStruct::{anonymous union} &)' is inaccessible
temp.cc:15: within this context