invalidate negative cache any time.

negative cache on a class which does not have subclasses was not
invalidated, but it should be invalidated because other classes
can cache this negative cache.
[Bug #17553]

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_method_cache.rb b/test/ruby/test_method_cache.rb
index a8e7e22ae3..2ed89e47bf 100644
--- a/test/ruby/test_method_cache.rb
+++ b/test/ruby/test_method_cache.rb
@@ -61,5 +61,16 @@ class TestMethodCache < Test::Unit::TestCase
 
     assert_equal :c2, c3.new.foo
   end
+
+  def test_negative_cache_with_and_without_subclasses
+    c0 = Class.new{}
+    c1 = Class.new(c0){}
+    c0.new.foo rescue nil
+    c1.new.foo rescue nil
+    c1.module_eval{ def foo = :c1 }
+    c0.module_eval{ def foo = :c0 }
+
+    assert_equal :c0, c0.new.foo
+  end
 end