It is useful to have an axiom in mach.peano.Peano that:
axiom injectivity: forall x y: Peano.t. (x:int) = y -> x = y
The meta reason is that Peano.t is in fact a record with an invariant! (which should have injectivity #287).
Step 1. Fetch and check out the branch for this merge request
git fetch origin git checkout -b feature/peano_injectivity origin/feature/peano_injectivity
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 feature/peano_injectivity
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.