Step 1. Fetch and check out the branch for this merge request

git fetch "https://gitlab.haskell.org/osa1/ghc.git" "port_16449_ghc_8_8"
git checkout -b "osa1/ghc-port_16449_ghc_8_8" 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/ghc-8.8"
git merge --no-ff "osa1/ghc-port_16449_ghc_8_8"

Step 4. Push the result of the merge to GitLab

git push origin "ghc-8.8"

Note that pushing to GitLab requires write access to this repository.

Tip: You can also checkout merge requests locally by following these guidelines.