* object.c (rb_obj_clone): attach clone to its singleton class during
  cloning singleton class so that singleton_method_added will be called
  on it.  based on the patch by shiba (satoshi shiba)[Bug #5283] in
  [ruby-dev:44477].  [Bug #5283]

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  stack when cloning into a new class to allow lexical const lookup to
  work as expected [ruby-core:47834] [Bug #7107]
* test/ruby/test_class.rb (class TestClass): related test

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	* class.c (rb_class_init_copy): rename to class_init_copy_check, performs type
	  checks on arguments to prevent reinitialization of initialized class
	  [ruby-core:50869] [Bug #7557]
	* class.c (rb_mod_init_copy): use class_init_copy_check if receiver is T_CLASS
	* test/ruby/test_class.rb (class TestClass): related test


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  of a class to the class, because refinements should have priority
  over prepended modules.

* test/ruby/test_refinement.rb: related test.

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  This change is a little tricky, so it might be better to prohibit
  module inclusion to refinements.

* include/ruby/ruby.h (RMODULE_INCLUDED_INTO_REFINEMENT): new flag
  to represent that a module (iclass) is included into a refinement.

* class.c (include_modules_at): set RMODULE_INCLUDED_INTO_REFINEMENT
  if klass is a refinement.

* eval.c (rb_mod_refine): set the superclass of a refinement to the
  refined class for super.

* eval.c (rb_using_refinement): skip the above superclass (the
  refined class) when creating iclasses for refinements.  Otherwise,
  `using Refinement1; using Refinement2' creates iclasses:
  <Refinement2> -> <RefinedClass> -> <Refinement1> -> RefinedClass,
  where <Module> is an iclass for Module, so RefinedClass is
  searched before Refinement1.  The correct iclasses should be
  <Refinement2> -> <Refinement1> -> RefinedClass.

* vm_insnhelper.c (vm_search_normal_superclass): if klass is an
  iclass for a refinement, use the refinement's superclass instead
  of the iclass's superclass.  Otherwise, multiple refinements are
  searched by super.  For example, if a refinement Refinement2
  includes a module M (i.e., Refinement2 -> <M> -> RefinedClass,
  and if refinements iclasses are <Refinement2> -> <M>' ->
  <Refinement1> -> RefinedClass, then super in <Refinement2> should
  use Refinement2's superclass <M> instead of <Refinement2>'s
  superclass <M>'.

* vm_insnhelper.c (vm_search_super_method): do not raise a
  NotImplementError if current_defind_class is a module included
  into a refinement.  Because of the change of
  vm_search_normal_superclass(), the receiver might not be an
  instance of the module('s iclass).

* test/ruby/test_refinement.rb: related test.

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  entry with VM_METHOD_TYPE_REFINED holds only the original method
  definition, so ci->me is set to a method entry allocated in the
  stack, and it causes SEGV/ILL.  In this commit, a method entry
  with VM_METHOD_TYPE_REFINED holds the whole original method entry.
  Furthermore, rb_thread_mark() is changed to mark cfp->klass to
  avoid GC for iclasses created by copy_refinement_iclass().

* vm_method.c (rb_method_entry_make): add a method entry with
  VM_METHOD_TYPE_REFINED to the class refined by the refinement if
  the target module is a refinement.  When a method entry with
  VM_METHOD_TYPE_UNDEF is invoked by vm_call_method(), a method with
  the same name is searched in refinements.  If such a method is
  found, the method is invoked.  Otherwise, the original method in
  the refined class (rb_method_definition_t::body.orig_me) is
  invoked.  This change is made to simplify the normal method lookup
  and to improve the performance of normal method calls.

* vm_method.c (EXPR1, search_method, rb_method_entry),
  vm_eval.c (rb_call0, rb_search_method_entry): do not use
  refinements for method lookup.

* vm_insnhelper.c (vm_call_method): search methods in refinements if
  ci->me is VM_METHOD_TYPE_REFINED.  If the method is called by
  super (i.e., ci->call == vm_call_super_method), skip the same
  method entry as the current method to avoid infinite call of the
  same method.

* class.c (include_modules_at): add a refined method entry for each
  method defined in a module included in a refinement.

* class.c (rb_prepend_module): set an empty table to
  RCLASS_M_TBL(klass) to add refined method entries, because
  refinements should have priority over prepended modules.

* proc.c (mnew): use rb_method_entry_with_refinements() to get
  a refined method.

* vm.c (rb_thread_mark): mark cfp->klass for iclasses created by
  copy_refinement_iclass().

* vm.c (Init_VM), cont.c (fiber_init): initialize th->cfp->klass.

* test/ruby/test_refinement.rb (test_inline_method_cache): do not skip
  the test because it should pass successfully.

* test/ruby/test_refinement.rb (test_redefine_refined_method): new
  test for the case a refined method is redefined.

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  VM_METHOD_TYPE_REFINED to the class refined by the refinement if
  the target module is a refinement.  When a method entry with
  VM_METHOD_TYPE_UNDEF is invoked by vm_call_method(), a method with
  the same name is searched in refinements.  If such a method is
  found, the method is invoked.  Otherwise, the original method in
  the refined class (rb_method_definition_t::body.orig_def) is
  invoked.  This change is made to simplify the normal method lookup
  and to improve the performance of normal method calls.

* vm_method.c (EXPR1, search_method, rb_method_entry),
  vm_eval.c (rb_call0, rb_search_method_entry): do not use
  refinements for method lookup.

* vm_insnhelper.c (vm_call_method): search methods in refinements if
  ci->me is VM_METHOD_TYPE_REFINED.  If the method is called by
  super (i.e., ci->call == vm_call_super_method), skip the same
  method entry as the current method to avoid infinite call of the
  same method.

* class.c (include_modules_at): add a refined method entry for each
  method defined in a module included in a refinement.

* class.c (rb_prepend_module): set an empty table to
  RCLASS_M_TBL(klass) to add refined method entries, because
  refinements should have priority over prepended modules.

* proc.c (mnew): use rb_method_entry_with_refinements() to get
  a refined method.

* test/ruby/test_refinement.rb (test_inline_method_cache): do not skip
  the test because it should pass successfully.

* test/ruby/test_refinement.rb (test_redefine_refined_method): new
  test for the case a refined method is redefined.

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  Feature #3222
* include/ruby/ruby.h: Fixnum instances are also frozen.
* class.c (singleton_class_of): check Bignum before
  singleton cheking.
* test/ruby/test_bignum.rb: add a test.
* test/ruby/test_fixnum.rb: ditto.
* test/ruby/marshaltestlib.rb, test/ruby/test_eval.rb,
  test/ruby/test_object.rb: catch up above changes.



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