extern void abort (void);
extern void foo (void);
extern void *bar (void);
typedef void (*func_p) (void);
extern const func_p p1;
func_p p2 = &foo;
func_p p3 = &foo;
int
main ()
{
void *p = bar ();
p1 ();
p2 ();
p3 ();
if (p != p1)
abort ();
return 0;
}