Cannot link with Base on OCaml 4.06

[Julow]

On OCaml < 4.06 it seems not possible to link both ocamlp-streams and the stdlib's Stream modules at the same time. The stdlib's module can often be a transitive dependency, for example of base.

A small ocaml program that links to both this library and base:

let () = Stream.(empty (Stream.of_list (Base.List.join [])))

(executable
 (name test)
 (libraries base camlp-streams))

The error looks like this:

File "test.ml", line 1:
Error: The files /home/jules/.opam/4.06.1/lib/camlp-streams/stream.cmi
       and /home/jules/.opam/4.06.1/lib/base/base.cmi
       make inconsistent assumptions over interface Stream

This happens in odoc-parser: ocaml-doc/odoc-parser#6

[kit-ty-kate]

Given this package is meant to be a compatibility package, I think it would be worth doing the same thing as with stdlib-shims and making the package empty on OCaml < 5.0

[dra27]

Something slightly different is wanted for 4.14.0 - if you’ve specified camlp-streams, it seems reasonable that you shouldn’t get the deprecation warning from the stdlib

[xavierleroy]

If I understand correctly, there's no problem with OCaml 4 versions that pack Stream as Stdlib.Stream, i.e. 4.07 and later. So, the package must be empty only on OCaml < 4.07. And I agree with @dra27 that it must not be empty for 4.14.

[kit-ty-kate]

That sounds fair enough indeed

[c-cube]

Just want to mention I met the same issue. I hope it gets released soon :)