Alternate
while (toktype == Alternate) {
e = newexpr(Alternate, 0, e, f);
while (toktype == Alternate) /* bogus but user-friendly */
while (toktype == Alternate) /* bogus but user-friendly */
if (e->type == Alternate)
case Alternate:
case Alternate:
case Alternate:
case '|': toktype = Alternate; break;