class Shoulda::Matchers::ActiveModel::ValidateComparisonOfMatcher

def failure_message_when_negated 

def failure_message_when_negated
  overall_failure_message_when_negated.dup.tap do |message|
    message << "\n"
    message <<
      failure_message_for_first_submatcher_that_fails_to_not_match
  end
end