def roundtrip(self, f, s):
st1 = f(s)
t = st1.totuple()
try:
st2 = parser.sequence2st(t)
except parser.ParserError as why:
self.fail("could not roundtrip %r: %s" % (s, why))
self.assertEqual(t, st2.totuple(),
"could not re-generate syntax tree")
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