BecomeClosed matchers isn't derived from Matcher - still needs aliases for RSpec 2.x compatability

lib/capybara/rspec/matchers.rb

@@ -175,6 +175,10 @@ module Capybara
       def failure_message_when_negated
         "expected #{@window.inspect} not to become closed after #{@wait_time} seconds"
       end
+
+      # RSpec 2 compatibility:
+      alias_method :failure_message_for_should, :failure_message
+      alias_method :failure_message_for_should_not, :failure_message_when_negated
     end
 
     def have_selector(*args, &optional_filter_block)