gcc-4.9/gcc/testsuite/gcc.c-torture/compile/20030530-3.c


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struct tree_decl
{
  unsigned in_system_header_flag:1;
};
union tree_node
{
  struct tree_decl decl;
};
typedef union tree_node *tree;
static int
redeclaration_error_message (olddecl)
     tree olddecl;
{
  if (({olddecl;})->decl.in_system_header_flag)
    ;
}