[ruby-cvs:63470] usa:r56305 (ruby_2_2): merge revision(s) 56111: [Backport #12738]

[usa at ruby-lang.org]

usa	2016-10-01 00:54:16 +0900 (Sat, 01 Oct 2016)

  New Revision: 56305

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56305

  Log:
    merge revision(s) 56111: [Backport #12738]
    
    * array.c (flatten): use rb_obj_class instead of rb_class_of
      because rb_class_of may return a singleton class.
      [ruby-dev:49781] [Bug #12738]

  Modified directories:
    branches/ruby_2_2/
  Modified files:
    branches/ruby_2_2/ChangeLog
    branches/ruby_2_2/array.c
    branches/ruby_2_2/test/ruby/test_array.rb
    branches/ruby_2_2/version.h