lastaddr         2064 user/usertests.c   char *c, *oldbrk, *a, *lastaddr, *p;
lastaddr         2083 user/usertests.c   lastaddr = (char*) (BIG-1);
lastaddr         2084 user/usertests.c   *lastaddr = 99;
lastaddr         2106 user/usertests.c   if(*lastaddr == 99){