context: raise runtime errors with sysstrs We should probably *not* use RuntimeError for this, but let's deal with that later, rather than as part of the Python 3 effort. Differential Revision: https://phab.mercurial-scm.org/D5108

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Greg Ward, author of the original bfiles extension

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Na'Tosha Bard of Unity Technologies

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Fog Creek Software

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Special thanks to the University of Toronto and the UCOSP program