class RSpec::Matchers::BuiltIn::CaptureStdout

def capture(block)
  captured_stream = CapturedStream.new
  captured_stream.as_tty = as_tty
  original_stream = $stdout
  $stdout = captured_stream
  block.call
  captured_stream.string
ensure
  $stdout = original_stream
end

def name
  'stdout'
end