OCaml has had pipes for a long time and it has also added let-operators, which are very similar to computation expressions. In the upcoming version 5 they are a

OCaml has had pipes for a long time and it has also added let-operators, which are very similar to computation expressions. In the upcoming version 5 they are also going to push towards direct-style coding of parallelism and concurrency thanks to the new effects systems, making 'futures', 'promises' etc. and their use with computation expressions obsolete.