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#include <stdlib.h>

int __attribute__ ((noinline)) debug (void) { return 1; }

int errors;

struct s { int elt; int (*compare) (int); };

static int

compare (const void *x, const void *y)

{

  const struct s *s1 = x, *s2 = y;

  int (*compare1) (int);

  int elt2;

  compare1 = s1->compare;

  elt2 = s2->elt;

  if (elt2 != 0 && debug () && compare1 (s1->elt) != 0)

    errors++;

  return compare1 (elt2);

}

int bad_compare (int x) { return -x; }

struct s array[2] = { { 1, bad_compare }, { -1, bad_compare } };

int

main (void)

{

  qsort (array, 2, sizeof (struct s), compare);

  return errors == 0;

}