vm_eval.c: next super class from the original

* 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]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49867 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Fri Mar  6 10:31:00 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* 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]
+
 Fri Mar  6 08:45:26 2015  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* lib/matrix.rb: Add Vector#round. Patch by Jordan Stephens.

test/ruby/test_module.rb

@@ -1748,6 +1748,17 @@ class TestModule < Test::Unit::TestCase
     assert_equal([m, c2, m, c1], c2.ancestors[0, 4], "should accesisble prepended module in superclass")
   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)

vm_eval.c

@@ -273,7 +273,8 @@ 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) {