LT_IF
retval = LT_IF;
retval = ifeval(&cp) - LT_IF + LT_ELIF;
retval = LT_IF;
if(at == LT_IF || bt == LT_IF) return (LT_IF);
if (lt != LT_IF) {
lt = LT_IF;
lt = LT_IF;
return (constexpression ? LT_IF : ret == LT_ERROR ? LT_IF : ret);