1 files changed, 9 insertions, 0 deletions
diff --git a/KNOWNBUGS.rb b/KNOWNBUGS.rb
index b97a08d928..d53bdb753b 100644
--- a/KNOWNBUGS.rb
+++ b/KNOWNBUGS.rb
@@ -3,3 +3,12 @@
 # So all tests will cause failure.
 #
 
+assert_equal 'false', %q{
+  x = Object.new.taint
+  class << x
+    def to_s; "foo".freeze; end
+  end
+  x.taint
+  [x].join("")
+  eval '"foo".freeze.tainted?'
+}