pushIor
pushIor(vm, ficlFileClose(ff));
pushIor(vm, !unlink(filename));
pushIor(vm, !rename(from, to));
pushIor(vm, ud != -1);
pushIor(vm, ud != -1);
pushIor(vm, ferror(ff->f) == 0);
pushIor(vm, ferror(ff->f) == 0);
pushIor(vm, ferror(ff->f) == 0);
pushIor(vm, fseek(ff->f, ud, SEEK_SET) == 0);
pushIor(vm, fflush(ff->f) == 0);
pushIor(vm, ficlFileTruncate(ff, ud) == 0);
pushIor(vm, f != NULL);