class RSpec::Matchers::BuiltIn::YieldWithArgs

def matches?(block)
  @args_matched_when_yielded = true
  @probe = YieldProbe.new(block) do
    @actual = @probe.single_yield_args
    @actual_formatted = actual_formatted
    @args_matched_when_yielded &&= args_currently_match?
  end
  return false unless @probe.has_block?
  @probe.probe
  @probe.yielded_once?(:yield_with_args) && @args_matched_when_yielded
end