void *fallible_malloc(size_t size, const char *const filename, int lineno) {
#ifdef FALLIBLE
  if (fallible_should_fail(filename, lineno)) {
    return NULL;
  }
#else
  (void)filename;
  (void)lineno;
#endif
  return malloc(size);
}

#define MALLOC(size) fallible_malloc(size, __FILE__, __LINE__)