Base deprecates some useful functions

Question

I am used to using the standard function print_int in OCaml, but when I open the library Base by Jane Street, as recommended in the book Real World OCaml, I obtain a deprecation warning:

utop # print_int;;
- : int -> unit = <fun>
utop # open Base;;
utop # print_int;;
Line 1, characters 0-9:
Alert deprecated: Base.print_int
- : int -> unit = <fun>

Even worse, when I build it with dune, as recommended in that book, warnings become errors. What should I do ? Replace print_int with printf "%i" ? or with Caml.print_int ? Both seem to work but look needlessly complicated. Something else ? Thank you.

Answer 1

This is answered here: https://ocaml.janestreet.com/ocaml-core/v0.13/doc/base/index.html#using-the-ocaml-standard-library-with-base

Base is intended as a full stdlib replacement. As a result, after an open Base, all the modules, values, types, etc., coming from the OCaml standard library that one normally gets in the default environment are deprecated.

In order to access these values, one must use the Caml library, which re-exports them all through the toplevel name Caml: Caml.String, Caml.print_string, ...