example

#include <string.h>
#include <stdlib.h>

#define defer(function) ((void)function)

int function(void)
{
  char *a = malloc(sizeof *a * 128);

  if (a == NULL)
  {
    return 0;
  }

  defer(free)(a);

  char *b = malloc(sizeof *b * 128);

  if (b == NULL)
  {
    // defer:
    //   call free(a);

    return 0;
  }

  defer(free)(b);

  char *c = malloc(sizeof *c * 128);

  if (c == NULL)
  {
    // defer:
    //   call free(a);
    //   call free(b);

    return 0;
  }

  defer(free)(c);

  memset(a, 0, sizeof *a * 128);
  memset(b, 0, sizeof *b * 128);
  memset(c, 0, sizeof *c * 128);

  if (1)
  {
    // defer: ???

    abort(); // critical error, exit, pthread_exit, ExitProcess, ExitThread etc.
  }

  // defer:
  //   call free(a);
  //   call free(b);
  //   call free(c);

  return 1;
}