class.c: check redefinition

* class.c (rb_prepend_module): check redefinition of built-in opimized
  methods.  [ruby-dev:47124] [Bug #7983]
* vm.c (rb_vm_check_redefinition_by_prepend): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39601 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 6b9ac4416b..5450c8ff3a 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1475,6 +1475,20 @@ class TestModule < Test::Unit::TestCase
     end
   end
 
+  def test_prepend_optmethod
+    bug7983 = '[ruby-dev:47124] [Bug #7983]'
+    assert_separately [], %{
+      module M
+        def /(other)
+          to_f / other
+        end
+      end
+      Fixnum.send(:prepend, M)
+      assert_equal(0.5, 1 / 2, "#{bug7983}")
+    }
+    assert_equal(0, 1 / 2)
+  end
+
   def test_class_variables
     m = Module.new
     m.class_variable_set(:@@foo, 1)