class RSpec::Matchers::BuiltIn::RespondTo

def with_arity
  str = ''.dup
  str << " with #{with_arity_string}" if @expected_arity
  str << " #{str.length == 0 ? 'with' : 'and'} #{with_keywords_string}" if @expected_keywords && @expected_keywords.count > 0
  str << " #{str.length == 0 ? 'with' : 'and'} unlimited arguments" if @unlimited_arguments
  str << " #{str.length == 0 ? 'with' : 'and'} any keywords" if @arbitrary_keywords
  str
end