There was an awful lot of zipping going on in
canDecomposableTyConAppOK, and one of the lists being zipped
was too short, causing the result to be too short. Easily
test case: typecheck/should_compile/T16188
Step 1. Fetch and check out the branch for this merge request
git fetch "https://gitlab.haskell.org/rae/ghc.git" "wip/T16188" git checkout -b "rae/ghc-wip/T16188" FETCH_HEAD
Step 2. Review the changes locally
Step 3. Merge the branch and fix any conflicts that come up
git fetch origin git checkout "origin/master" git merge --no-ff "rae/ghc-wip/T16188"
Step 4. Push the result of the merge to GitLab
git push origin "master"
Note that pushing to GitLab requires write access to this repository.
Tip: You can also checkout merge requests locally by following these guidelines.