KOBAYASHI Shuji 66211394e1 Enumerator::Chain#rewind shouldn't rewind elements aren't iterated ...

### Example:

  ```ruby
  # example.rb
  e = [1]
  def e.rewind; p :r end
  c = e.chain(e)
  c.each{break c}.rewind
  ```

#### Before this patch:

  ```terminal
  $ bin/mruby example.rb
  :r
  :r
  ```

#### After this patch (same as Ruby):

  ```terminal
  $ bin/mruby example.rb
  :r
  ```

2019-09-02 08:58:33 +09:00

..

mrblib

Enumerator::Chain#rewind shouldn't rewind elements aren't iterated

2019-09-02 08:58:33 +09:00

test

Enumerator::Chain#rewind shouldn't rewind elements aren't iterated

2019-09-02 08:58:33 +09:00

mrbgem.rake

Add enumerator chain feature (CRuby-2.6 compatible)

2019-01-03 18:16:26 +09:00