tabcol
i = tabcol(outcol, value(vi_HARDTABS));
int i = tabcol(destcol, value(vi_TABSTOP)) - destcol;
inssiz = tabcol(inscol, value(vi_TABSTOP)) - inscol;
if (inssiz >= doomed + tabcol(tabstart, value(vi_TABSTOP)) - tabstart) {
int tabcol(int, int);
i = tabcol(outcol, HARDTABS);