Jack O'Connor a0355ba8e0 add the --num-threads flag ... As part of this change, make the rayon and memmap dependencies mandatory. This simplifies the code a lot, and I'm not aware of any callers who build b3sum without the default dependencies. If --num-threads is not given, or if its value is 0, b3sum will still respect the RAYON_NUM_THREADS environment variable.		2020-03-16 12:24:03 -04:00
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main.rs	add the --num-threads flag	2020-03-16 12:24:03 -04:00