* enumerator.c: implement Enumerator#{next_values,peek_values,feed}

  and StopIteration#result.  [ruby-dev:39109]
  (struct enumerator): replace no_next by stop_exc.
  new field feedvalue.
  (enumerator_mark): mark feedvalue and stop_exc.
  (enumerator_init): initialize feedvalue and stop_exc.
  (enumerator_init_copy): initialize feedvalue.
  (next_ii): send yield arguments as an array.  return feedvalue.
  (next_i): generate StopIteration exception here.  set result.
  (next_init): initialize feedvalue.
  (enumerator_next_values): new method Enumerator#next_values.
  (ary2sv): new function.
  (enumerator_peek_values): new method Enumerator#peek_values.
  (enumerator_feed): new method Enumerator#feed.
  (yielder_yield): return the yield value.
  (generator_each): return the iterator value.
  (stop_result): new method StopIteration#result.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@24587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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