class RSpec::Matchers::DSL::Matcher

def matches?(actual)
  @actual = actual
  if @expected_exception
    begin
      instance_eval_with_args(actual, &@match_block)
      true
    rescue @expected_exception => @rescued_exception
      false
    end
  else
    begin
      instance_eval_with_args(actual, &@match_block)
    rescue RSpec::Expectations::ExpectationNotMetError
      false
    end
  end
end