vreplace
vreplace(0, lines, lineDOL());
vreplace(vcline, cnt, 1);
vreplace(vcline, i, nlput);
vreplace(undap1 - addr, undap2 - undap1,
vreplace(vcline, i, 0);
vreplace(vcline, cnt, 0);
vreplace(vcline, cnt, cnt);
vreplace(vcline, cnt, undap2 - undap1);