text: #include <malloc.h>
  #include <stdlib.h>
  
  #include "../test_util.h"
  
  OPTNONE int main(void) {
      char *p = malloc(256 * 1024);
      if (!p) {
          return 1;
      }
      size_t size = malloc_usable_size(p);
      *(p + size) = 0;
      free(p);
      return 0;
  }
  