368         // move @ tags out of variable namespace
395     protected function expression(&$out)  argument
398             $out = $this->expHelper($lhs, 0);
405                     $out = ['list', '', [$out, ['keyword', '/'], $rhs]];
500     protected function parenValue(&$out)  argument
513             $out = $exp;
580     protected function import(&$out)  argument
589             $out = ['import', $value];
595     protected function mediaQueryList(&$out)  argument
598             $out = $list[2];
604     protected function mediaQuery(&$out)  argument
641         $out = $parts;
645     protected function mediaExpression(&$out)  argument
653             $out = ['mediaExp', $feature];
654             if ($value) $out[] = $value;
657             $out = ['variable', $variable];
666     protected function openString($end, &$out, $nestingOpen = null, $rejectStrs = null)  argument
730         $out = ['string', '', $content];
734     protected function stringValue(&$out)  argument
777             $out = ['string', $delim, $content];
785     protected function interpolation(&$out)  argument
794             $out = ['interpolate', $interp];
821     protected function color(&$out)  argument
825                 $out = ['string', '', [$m[1]]];
827                 $out = ['raw_color', $m[1]];
992                     break; // get out early
1296     protected function genericList(&$out, $parseItem, $delim = '', $flatten = true)  argument
1314             $out = $items[0];
1316             $out = ['list', $delim, $items];
1326     protected function to($what, &$out, $until = false, $allowNewline = false)  argument
1335         $out = $m[1];
1340     protected function match($regex, &$out, $eatWhitespace = null)  argument
1345         if (preg_match($r, $this->buffer, $out, 0, $this->count)) {
1346             $this->count += strlen($out[0]);
1374     protected function peek($regex, &$out = null, $from = null)  argument
1378         return preg_match($r, $this->buffer, $out, 0, $from);
1474         $out = '';
1515             $out .= substr($text, 0, $count) . str_repeat("\n", $newlines);
1521         return $out . $text;