# File lib/rspec/matchers/built_in/be.rb, line 109
        def failure_message_for_should_not
          message = "`\#{negative_expectation_expression}` not only FAILED,\nit is a bit confusing.\n"

          raise message << ([:===,:==].include?(@operator) ?
                            "It might be more clearly expressed without the \"be\"?" :
                            "It might be more clearly expressed in the positive?")
        end