Add MultilineStrings extension

[brandonchinn178]

• Patches conform to the coding conventions.
• Any changes that could be relevant to users have been recorded in the changelog.
• The documentation has been updated, if necessary.
• Manual QA notes have been included.
• Tests have been added. (Ask for help if you don’t know how to write them! Ask for an exemption if tests are too complex for too little coverage!)

[ulysses4ever]

Hooray!

Although, Cabal-tests/tests/UnitTests/Distribution/Utils/Structured.hs will probably have to be updated.

[brandonchinn178]

That's... annoying 🫤 Any reason why it's not just a golden test? It would be more auditable and easier to update.

Presumably CI will fail with the new hash, right? I'll update when that happens.

[ulysses4ever]

Hey @brandonchinn178! Thanks for your contribution! Please, check out our contributing guidelines w.r.t. GitHub PR lifecycle: https://github.com/haskell/cabal/blob/master/CONTRIBUTING.md#github-pull-request-conventions We don't merge manually and rather defer to a bot, which implements a cooldown period among other things. A PR author is supposed to apply a merge label when they are ready to hand the PR over to the bot.

[brandonchinn178]

ah sorry! Happy to do any revert operations, just let me know

[ulysses4ever]

No, that's fine. Just for the future reference.