Method check

Lib/test/test_sys.py:1254–1258

(tracebacklimit, expected)

            f2()
        """
        def check(tracebacklimit, expected):
            p = subprocess.Popen([sys.executable, '-c', code % tracebacklimit],
                                 stderr=subprocess.PIPE)
            out = p.communicate()[1]
            self.assertEqual(out.splitlines(), expected)

        traceback = [
            b'Traceback (most recent call last):',