OCaml lwt utop infix bind operator >>= is missing

Question

I call require "lwt.simple-top" ;; on utop and try a simple example but it is not able to find the operator >>=.

You can get it if you `open Lwt` first. – Steve Vinoski Dec 20 '15 at 15:51 — Steve Vinoski, Dec 20 '15 at 15:51
Or `open Lwt.Infix` if you only want to pull in operators. – hcarty Dec 20 '15 at 17:34 — hcarty, Dec 20 '15 at 17:34

score 5 · Accepted Answer · answered Dec 21 '15 at 03:59

The #require is a toplevel directive, that link the library code into the toplevel. It doesn't open any modules. So in order to get the infix operators >>= and >|=, you need to open Lwt.Infix or Lwt modules, the latter will also bring all definitions from Lwt module, that may be considered as a namespac pollution.

OCaml lwt utop infix bind operator >>= is missing

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