1 files changed, 11 insertions, 0 deletions
diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 7cf5b8a98d..9fe64b38a0 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1088,6 +1088,17 @@ class TestHash < Test::Unit::TestCase
     assert_predicate(h.dup, :compare_by_identity?, bug8703)
   end
 
+  def test_same_key
+    bug9646 = '[ruby-dev:48047] [Bug #9646] Infinite loop at Hash#each'
+    h = @cls[a=[], 1]
+    a << 1
+    h[[]] = 2
+    a.clear
+    cnt = 0
+    r = h.each{ break nil if (cnt+=1) > 100 }
+    assert_not_nil(r,bug9646)
+  end
+
   class ObjWithHash
     def initialize(value, hash)
       @value = value