add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17434 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

KNOWNBUGS.rb

@@ -3,3 +3,11 @@
 # So all tests will cause failure.
 #
 
+assert_normal_exit %q{
+  r = Range.allocate
+  def r.<=>(o) true end
+  r.instance_eval { initialize r, r }
+  r.inspect
+}
+
+