#7841 Module#prepend now detect cyclic prepend.
  #7843 removing prepended methods causes exceptions.
  #8357 Module#prepend breaks Module's comparison operators.
  #7983 Module#prepend can't override Fixnum's operator methods.
  #8005 methods made private/protected after definition become uncallable on prepended class.
  #8025 Module#included_modules include classes when prepended.

  #7922 unnamed keyword rest argument cause SyntaxError.
  #7942 support define method only receive keyword arguments without paren.
  #8008 fix a bug in super with keyword arguments.
  #8236 fix a treatment of rest arguments and keyword arguments through `super'.
  #8260 non-symbol key should not treated as keyword arguments.

  #7925 fix a bug of refinements with a method call super in a block.

  #8092 improve accuracy of GC.stat[:heap_live_num]
  #8146 avoid unnecessary heap growth.
  #8145 fix unlimited memory growth with large values of RUBY_FREE_MIN.

  #7972 Regexp POSIX space class is location sensitive.
  #7974 Regexp case-insensitive group doesn't work.
  #8023 Regexp lookbehind assertion fails with /m mode enabled
  #8001 Regexp \Z matches where it shouldn't

  #8063 fix a potential memory violation and avoid abort on the environment _FORTIFY_SOURCE=2 (ex. Ubuntu).
  #8175 ARGF#skip doesn't work as documented.
  #8069 File.expand_path('something', '~') now support home path on Windows.
  #8220 fix a Segmentation fault when defined? ().
  #8367 fix a regression in defined?(super).
  #8283 Dir.glob doesn't recurse hidden directories.
  #8165 fix a bug of multiple require with non-ascii file path.
  #8290 fix an incompatible String#inspect behavior with NUL character.
  #8360 fix a Segmentation fault of Thread#join(Float::INFINITY) on some platforms.

  Bundled RubyGems version is updated to 2.0.2+
  #7698 fix an rubygems' incompatibility about installation of extension libraries.
  #8019 fix a bug of gem list --remote doesn't work.

  #7911 File.fnmatch with US-ASCII pattern and UTF-8 path raise an exception.
  #8240 fix a bug about OpenSSL::SSL::SSLSocket breaks other connections or files on GC.
  #8183 CGI.unescapeHTML can't decode Numeric Character References with uppercase (&#Xnnnn).

  #7830 fix build failure with compiler warning.
  #7950 fix a build failure on mswin/VC with --with-static-linked-ext.