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Feedback on this post is welcomed on Discuss! We are extremely happy to announce the release of opam 2.4.0 and encourage all users to upgrade. Please read on for installation and upgrade instructions. Major changes On opam init the compiler chosen for the default switch will no longer be ocaml-syste...

opam 2.4 was branched last week… very pleasing to see Ryan’s work on Nix depext support get merged (we spent quite a bit of time on that together last summer). It’s a subtle-sounding (huge) change, but the move away from relying on patch and diff as external commands (which has been a HUGE amount of work done by @kit-ty-kate) paves the way for being able to sort out the incredible slowness of opam update on Windows.

Over the weekend, I extended mtelvers/ocaml-box-diff to include the ability to upload files over 50MB. This is a more complex API which requires a call to https://upload.box.com/api/2.0/files/upload_sessions by posting JSON containing the name of the file, the folder ID and the file size. Box replies with various session endpoints which give the URIs to use to upload the parts and to commit the the file. Box also specifies the size of each part.

THERE are various techniques and tools to do unit testing in OCaml. A small selection: Alcotest -...

Some notes on using ppx_expect to unit test

We are pleased to announce the release of opam 2.0.4. This new version contains some backported fixes: Sandboxing on macOS: considering the possibility that TMPDIR is unset [#3597 @herbelin - fix #3576] display: Fix opam config var display, aligned on opam config list [#3723 @rjbou - rel. #3717] pin...

The diff list trick is a way to compute with lists in types. It allows to create heterogeneous lists which is very useful, in particular in the Format module from the standard library.