marshaltestlib.rb: descriptive assertions

* test/ruby/marshaltestlib.rb (MarshalTestLib#test_string_ivar)
  (MarshalTestLib#test_string_subclass_cycle): use more descriptive
  assertions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39641 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
marshal.c: prepended objects

* marshal.c (r_object0): load prepended objects.  treat the class of
  extended object in the included modules as prepended singleton
  class. [ruby-core:53202] [Bug #8041]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39642 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-03-09

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e