merge revision(s) 49867: [Backport ruby#10847] [Backport ruby#10970]

	* vm_eval.c (vm_call_super): search next super class from the
	  original class, to get rid of infinite recursion with
	  prepending.  a patch by Seiei Higa <hanachin AT gmail.com> at
	  [ruby-core:68434].  [ruby-core:68093] [Bug ruby#10847]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@50284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: unak

ChangeLog

@@ -1,3 +1,10 @@
+Mon Apr 13 16:48:14 2015  Nobuyoshi Nakada  <[email protected]>
+
+	* vm_eval.c (vm_call_super): search next super class from the
+	  original class, to get rid of infinite recursion with
+	  prepending.  a patch by Seiei Higa <hanachin AT gmail.com> at
+	  [ruby-core:68434].  [ruby-core:68093] [Bug #10847]
+
 Mon Apr 13 16:39:57 2015  Nobuyoshi Nakada  <[email protected]>
 
 	* parse.y (arg): fix segfault by null caused by syntax error.

test/ruby/test_module.rb

@@ -1708,6 +1708,17 @@ def hello
     assert_equal('hello!', foo.new.hello, bug9236)
   end
 
+  def test_prepend_call_super
+    assert_separately([], <<-'end;') #do
+      bug10847 = '[ruby-core:68093] [Bug #10847]'
+      module M; end
+      Float.prepend M
+      assert_nothing_raised(SystemStackError, bug10847) do
+        0.3.numerator
+      end
+    end;
+  end
+
   def test_class_variables
     m = Module.new
     m.class_variable_set(:@@foo, 1)

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.1.5"
 #define RUBY_RELEASE_DATE "2015-04-13"
-#define RUBY_PATCHLEVEL 330
+#define RUBY_PATCHLEVEL 331
 
 #define RUBY_RELEASE_YEAR 2015
 #define RUBY_RELEASE_MONTH 4

vm_eval.c

@@ -260,7 +260,8 @@ vm_call_super(rb_thread_t *th, int argc, const VALUE *argv)
 	rb_bug("vm_call_super: should not be reached");
     }
 
-    klass = RCLASS_SUPER(cfp->klass);
+    klass = RCLASS_ORIGIN(cfp->klass);
+    klass = RCLASS_SUPER(klass);
     id = cfp->me->def->original_id;
     me = rb_method_entry(klass, id, &klass);
     if (!me) {