Because Bucklescript/ReScript is based on a modified fork of OCaml 4.06, before monadic let was added. https://github.com/rescript-lang/ocaml https://github.co

Because Bucklescript/ReScript is based on a modified fork of OCaml 4.06, before monadic let was added. https://github.com/rescript-lang/ocaml https://github.com/rescript-lang/ocaml "This branch is 387 commits ahead, 5444 commits behind ocaml:trunk"