[PATCH] fragment caching TypeError can't modify frozen object

Ruby 1.8.7 on 2-3-stable

(in /home/santiago/Documentos/WyeWorks/Proys/rails/actionpack)
Attempting to load Active Record... success
Loaded suite /usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
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Finished in 34.35891 seconds.

  1) Error:
test_fragment_for(FragmentCachingTest):
TypeError: can't modify frozen object
    ./test/../../activesupport/lib/active_support/core_ext/string/output_safety.rb:20:in `html_safe!'
    ./test/../lib/action_controller/caching/fragments.rb:40:in `fragment_for'
    ./test/controller/caching_test.rb:619:in `test_fragment_for'
    ./test/../../activesupport/lib/active_support/testing/setup_and_teardown.rb:62:in `__send__'
    ./test/../../activesupport/lib/active_support/testing/setup_and_teardown.rb:62:in `run'

2468 tests, 11406 assertions, 0 failures, 1 errors
rake aborted!
Command failed with status (1): [/usr/bin/ruby1.8 -I"lib:test" "/usr/lib/ru...]