#include <stdlib.h>

extern int add_all_ints(int x, int y, int z, ...) __attribute__((sentinel));

void valid_call(int *a, int *b, int *c) {
  // fine
  int x = add_all_ints(0, 0, 0, a, b, c, NULL);
}

void truncated_call(void) {
  int a = 0, b = 1, c = 2, d = 3;
  int *p = NULL;

  // warning: p is NULL so only first argument sent to add_all_ints
  int x = add_all_ints(0, 0, 0, &a, p, &b, &c, &d, NULL);
}