t / t4034 / bibtex / preon commit builtin/apply: make parse_whitespace_option() return -1 instead of die()ing (aaf6c44)
   1@article{aldous1987uie,
   2  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
   3  author={Aldous, D.},
   4  journal={Information Theory, IEEE Transactions on},
   5  volume={33},
   6  number={2},
   7  pages={219--223},
   8  year={1987},
   9}