current_group

        # PrettyPrint.current_group

(from ruby core)
---
    current_group()

---

Returns the group most recently added to the stack.

Contrived example:
    out = ""
    => ""
    q = PrettyPrint.new(out)
    => #<PrettyPrint:0x82f85c0 @output="", @maxwidth=79, @newline="\n", @genspace=#<Proc:0x82f8368@/home/vbatts/.rvm/rubies/ruby-head/lib/ruby/2.0.0/prettyprint.rb:82 (lambda)>, @output_width=0, @buffer_width=0, @buffer=[], @group_stack=[#<PrettyPrint::Group:0x82f8138 @depth=0, @breakables=[], @break=false>], @group_queue=#<PrettyPrint::GroupQueue:0x82fb7c0 @queue=[[#<PrettyPrint::Group:0x82f8138 @depth=0, @breakables=[], @break=false>]]>, @indent=0>
    q.group {
      q.text q.current_group.inspect
      q.text q.newline
      q.group(q.current_group.depth + 1) {
        q.text q.current_group.inspect
        q.text q.newline
        q.group(q.current_group.depth + 1) {
          q.text q.current_group.inspect
          q.text q.newline
          q.group(q.current_group.depth + 1) {
            q.text q.current_group.inspect
            q.text q.newline
          }
        }
      }
    }
    => 284
     puts out
    #<PrettyPrint::Group:0x8354758 @depth=1, @breakables=[], @break=false>
    #<PrettyPrint::Group:0x8354550 @depth=2, @breakables=[], @break=false>
    #<PrettyPrint::Group:0x83541cc @depth=3, @breakables=[], @break=false>
    #<PrettyPrint::Group:0x8347e54 @depth=4, @breakables=[], @break=false>