protected function makeOutputBlock($type, $selectors = null)
    {
        $out = new OutputBlock;
        $out->type         = $type;
        $out->lines        = [];
        $out->children     = [];
        $out->parent       = $this->scope;
        $out->selectors    = $selectors;
        $out->depth        = $this->env->depth;
        $out->sourceName   = $this->env->block->sourceName;
        $out->sourceLine   = $this->env->block->sourceLine;
        $out->sourceColumn = $this->env->block->sourceColumn;

        return $out;
    }