Prepare for release

[raphael-proust]

Version 5.7.0

Don't merge for now

[MisterDA]

Can you consider merging #967 before cutting the release?

[raphael-proust]

I'm reticent in including this because it copies some code that's under a different and incompatible license. It's very short and it's the logical thing to do, but still it's the same code.

Something similarish (bigger chunks of code) happened with Eio: ocaml-multicore/eio#352 (comment)

I can think of a few ways solve this, but none seem very satisfactory:

• merge anyway (but I'm not a lawyer and I don't know if that's ok)
• create a separate LGPL library which includes just the bit of code we need and link against that from Lwt (but it's a lot of boilerplate)
• open a PR upstream to make the chunk of code we need be its own function so we can call it (but it's a potentially long process and forces us to depend on newly releases of OCaml)

If you see another alternative or if you can make a good case for one of those, maybe I can merge the PR or another equivalent PR.

[MisterDA]

There were a few comments from February on the ocamllabs slack channel suggesting the code snippet was small enough to be merged.
If you're still worried about license considerations, I strongly suggest you merge the related code we know won't be affected, like the failing test. You might then get someone without knowledge of the code snippet (a willing intern? a dedicated hackers' grandmother?) to write a clean-room implementation of it, without looking at the source of the stdlib, with the help of the test. But I'm not a lawyer.

[samwgoldman]

Now that 5.1.0~rc1 is released, I'd like to give it a try, but we currently can't test because of our dependency on Lwt. Looking forward to a release with compatibility with OCaml 5.1. Thank you!

[raphael-proust]

Now that 5.1.0~rc1 is released, I'd like to give it a try, but we currently can't test because of our dependency on Lwt. Looking forward to a release with compatibility with OCaml 5.1. Thank you!

The release should be merged soon. The PR for it is ocaml/opam-repository#24213