Failing Test: missing I18n::Backend::Simple::Dispatcher

I'm having trouble getting all tests to pass on edge rails (1b0afb31dfc71674b054459c2e0418ca3a709467). Over a hundred tests fail with this (or similar) error message.

  1) Error: test_error_for_block(ActiveRecordHelperTest): NameError: uninitialized constant I18n::Backend::Simple::Dispatcher     ./test/../../activesupport/lib/active_support/dependencies.rb: 102:in `const_missing'     ./test/../../activesupport/lib/active_support/vendor/i18n-0.0.1/ i18n/backend/simple.rb:10:in `initialize'     ./test/../../activesupport/lib/active_support/vendor/i18n-0.0.1/ i18n.rb:20:in `new'     ./test/../../activesupport/lib/active_support/vendor/i18n-0.0.1/ i18n.rb:20:in `backend'     ./test/../../activesupport/lib/active_support/vendor/i18n-0.0.1/ i18n.rb:153:in `t'     ./test/../lib/action_view/helpers/active_record_helper.rb:197:in `error_messages_for'     ./test/../../activesupport/lib/active_support/core_ext/object/ misc.rb:63:in `with_options'     ./test/../lib/action_view/helpers/active_record_helper.rb:192:in `error_messages_for'     ./test/template/active_record_helper_test.rb:192:in `test_error_for_block'     ./test/../../activesupport/lib/active_support/testing/ setup_and_teardown.rb:94:in `__send__'     ./test/../../activesupport/lib/active_support/testing/ setup_and_teardown.rb:94:in `run'

I have the latest i18n gem installed, so I'm not sure what the problem could be. Anyone else having this problem?

Yeah, I see this too. Fix is forthcoming.