We have the pleasure of celebrating the birthdays of Camille Saint-Saëns and Karl Schwarzschild by announcing the release of OCaml version 5.4.0. Some of the highlights of OCaml 5.4.0 are: Labelled tuples It is now possible to put labels on tuple fields let ( * ) (x,~dx) (y,~dx:dy) = x*.y, ~dx:(x *. dy +. y *. dx ) Those labeled tuples are equivalent to SML records: they are an order-dependent and structurally-typed variants of records. They are mostly intended for local types. Array literal syntax support for immutable arrays and floatarrays The array literal syntax is now shared by array-like primitive datatypes, like 'a array, floatarray and immutable array iarray. For instance, this code let x = let x = Array.Flotarray.create 3 in Array.Flotarray.set x 0 1.; Array.Flotarray.set x 1 2.; Array.Flotarray.set x 2 3.; x can now be written let x : floatarray = [|0.; 1.; 2.|] This also supported in patterns let one = match x with | [|_;y;_|] -> Some y | _ -> None However array indexing still needs to go through user-defined indexing operator let (.$()) = Array.Floatarray.get let (.$()