# File lib/sass/tree/import_node.rb, line 71
      def perform!(environment)
        environment.push_frame(:filename => @filename, :line => @line)
        options = @options.dup
        options.delete(:syntax)
        root = Sass::Files.tree_for(full_filename, options)
        @template = root.template
        self.children = root.children
        self.children = perform_children(environment)
      rescue Sass::SyntaxError => e
        e.modify_backtrace(:filename => full_filename)
        e.add_backtrace(:filename => @filename, :line => @line)
        raise e
      ensure
        environment.pop_frame
      end