Roll back to mypy 0.521 to avoid a bug in 0.530.
Filed here:
We should go back to tracking the latest mypy releases as soon as
possible.
@@ -9,7 +9,7 @@ addons:
packages:
- python3-pip
install:
- - pip3 install --user --upgrade mypy flake8
+ - pip3 install --user --upgrade mypy==0.521 flake8
- travis_wait ./check-rustfmt.sh --install
script: ./test-all.sh
cache:
