#define ten(a) a a a a a a a a a a
#define C0 call();
#define C1 ten(C0)
#define C2 ten(C1)
#define C3 ten(C2)
#define C4 ten(C3)
#define C5 ten(C4)
#define C6 ten(C5)
int call(void) { return -1; }
void foo(void) { C6 }
int main() { foo(); return 0; }