File: main.c

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#include <stdlib.h>

struct pair
{
  int x;
  int y;
};

void foo(struct pair *p) __CPROVER_requires(p != NULL) __CPROVER_assigns(p->y)
  __CPROVER_ensures(p->y == __CPROVER_old(p->y) + 5)
{
  p->y = p->y + 5;
}

int main()
{
  struct pair *p = malloc(sizeof(*p));
  p->x = 2;
  p->y = 2;
  foo(p);
  assert(p->y != 7);

  return 0;
}