Fix miri failures by preserving provenance in BitSpan::new_unchecked
#153
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It seems the fix for the miri failures proposed by @tavianator hasn't been committed yet so I gave it a go.
Fix the miri failures in doctests, see issue #135. The issue is that miri doesn't guess correct provenance in the int-to-ptr cast in
BitSpan::new_unchecked
, as was found by @tavianator here.The solution is to preserve provenance and was proposed by @tavianator here. With this change the entire test suite passes under miri.