lastaddr         1418 usertests.c      char *a, *b, *c, *lastaddr, *oldbrk, *p, scratch;
lastaddr         1460 usertests.c      lastaddr = (char*) (BIG-1);
lastaddr         1461 usertests.c      *lastaddr = 99;
lastaddr         1483 usertests.c      if(*lastaddr == 99){