hmm, there is a compat version of numba that should be ok on 3.5/1.10.

Codecov Report

Merging #18993 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18993      +/-   ##
==========================================
- Coverage   91.58%   91.56%   -0.03%     
==========================================
  Files         150      150              
  Lines       48972    48972              
==========================================
- Hits        44851    44839      -12     
- Misses       4121     4133      +12

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so #18994 actually makes this error show up (and that is why I think you have it on 0.22.x branch, its using the latest conda), while on master I pinned to 4.3.30 which I thought was causing the issues. https://travis-ci.org/pandas-dev/pandas/jobs/322965133.

just going to skip for old numpy for now on those tests. i don't think its a big deal.

you can cherry-pick the commit to 0.22.x

closed in favor of #18995