How to use the icecream.stderrPrint function in icecream

def testPrefixConfiguration(self):
        prefix = 'lolsup '
        with configureIcecreamOutput(prefix, stderrPrint):
            with disableColoring(), captureStandardStreams() as (out, err):
                ic(a)
        pair = parseOutputIntoPairs(out, err, 1, prefix=prefix)[0][0]
        assert pair == ('a', '1')

        def prefixFunction():
            return 'lolsup '
        with configureIcecreamOutput(prefix=prefixFunction):
            with disableColoring(), captureStandardStreams() as (out, err):
                ic(b)
        pair = parseOutputIntoPairs(out, err, 1, prefix=prefixFunction())[0][0]
        assert pair == ('b', '2')

def disableColoring():
    originalOutputFunction = ic.outputFunction

    ic.configureOutput(outputFunction=stderrPrint)
    yield
    ic.configureOutput(outputFunction=originalOutputFunction)