add test for Struct.new(0).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16274 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_knownbug.rb

@@ -189,3 +189,10 @@ assert_normal_exit %q{
   end
 }, '[ruby-dev:34536]'
 
+
+assert_normal_exit %q{
+  begin
+    Struct.new(0)
+  rescue
+  end
+}