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next line of input (or b"" for EOF).  It generates 5-tuples with these
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    the ending (row, column) indices of the token (a 2-tuple of ints)
    the original line (string)

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    Round-trip invariant for limited input:
        # Output bytes will tokenize back to the input
        t1 = [tok[:2] for tok in tokenize(f.readline)]
        newcode = untokenize(t1)
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