# File lib/vendor/fssm/tree.rb, line 34
    def each(prefix=nil, &block)
      @children.each do |segment, node|
        cprefix = prefix ? 
                  Pathname.for(prefix).join(segment) :
                  Pathname.for(segment)
        block.call(cprefix, node)
        node.each(cprefix, &block)
      end
    end