Fix python3.8 / pypy failures

[asottile]

Resolves #4716

[codecov]

Codecov Report

Merging #4804 into master will decrease coverage by 0.01%.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master    #4804      +/-   ##
==========================================
- Coverage   95.65%   95.64%   -0.02%     
==========================================
  Files         113      113              
  Lines       25057    25066       +9     
  Branches     2489     2493       +4     
==========================================
+ Hits        23968    23974       +6     
- Misses        768      770       +2     
- Partials      321      322       +1

Flag	Coverage Δ
#docs	29.6% <0%> (-62.59%)	⬇️
#doctesting	29.6% <0%> (-62.59%)	⬇️
#linting	29.6% <0%> (-62.59%)	⬇️
#linux	95.46% <27.27%> (-0.02%)	⬇️
#nobyte	92.18% <27.27%> (-0.03%)	⬇️
#numpy	92.98% <27.27%> (-0.01%)	⬇️
#pexpect	42.05% <0%> (+0.01%)	⬆️
#pluggymaster	93.7% <27.27%> (+0.03%)	⬆️
#py27	93.65% <27.27%> (-0.01%)	⬇️
#py34	91.57% <27.27%> (-0.03%)	⬇️
#py35	91.56% <27.27%> (-0.03%)	⬇️
#py36	91.58% <27.27%> (-0.03%)	⬇️
#py37	93.77% <27.27%> (-0.01%)	⬇️
#trial	92.98% <27.27%> (-0.01%)	⬇️
#windows	93.67% <27.27%> (-0.83%)	⬇️
#xdist	93.68% <27.27%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
testing/test_skipping.py	97.65% <0%> (-1.03%)	⬇️
testing/code/test_source.py	95.53% <42.85%> (-1.01%)	⬇️
src/_pytest/terminal.py	91.85% <0%> (+0.81%)	⬆️

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[asottile]

This is ready to go, despite the status list