* vm.c (rb_vm_check_redefinition_opt_method): should check the real

  class instead of the origin iclass.
  [ruby-core:72188] [Bug #11826]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 0 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 5356983135..1a852f84a0 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1695,6 +1695,22 @@ class TestModule < Test::Unit::TestCase
     assert_equal(0, 1 / 2)
   end
 
+  def test_redefine_optmethod_after_prepend
+    bug11826 = '[ruby-core:72188] [Bug #11826]'
+    assert_separately [], %{
+      module M
+      end
+      class Fixnum
+        prepend M
+        def /(other)
+          quo(other)
+        end
+      end
+      assert_equal(1 / 2r, 1 / 2, "#{bug11826}")
+    }, ignore_stderr: true
+    assert_equal(0, 1 / 2)
+  end
+
   def test_prepend_visibility
     bug8005 = '[ruby-core:53106] [Bug #8005]'
     c = Class.new do