Hi, I’m new to OCaml and I’m trying to understand how to use dune. I constructed a minimal example that looks like this: . ├── dune-project ├── lib │ ├── dune │ ├── mylib.ml │ └── mymod.ml └── test ├── dune └── test.ml The dune-project file just contains one line: (lang dune 3.12) T…

See Using Modules (15 characters long now) - #4 by cuihtlauac

From that other thread: [image] Using Modules (15 characters long now) In this case suppose you have lib/ which contains: dune mymodule.ml othermodule.ml And dune contains: (library (name lib)) Then the modules will be available as: Lib.Mymodule and Lib.Othermodule. I do have a lib/dune …

If you create a mylib.ml file for a lib named mylib in the dune file, it does not behave as a submodule but rather allows you to define the content of the top-level Mylib module. This allows you to re-export some submodules for instance, with a different name.

So the solution then is to modify mylib.ml, I guess: +module Mymod = Mymod let one = 1 let _ = assert (one = 1) let _ = assert (Mymod.two = 2) Would that be the idiomatic way to go?

I think so. If you want top-level values (or types) to appear in Mylib, then I think you need an explicit mylib.ml. And if you do that, then you need to define module aliases to export the inner modules. I tried to find the relevant info in the dune documentation but it seems this is only mentioned…

Thank you both for your help. Maybe the documentation could be improved. It was really confusing me a lot, but I think it now makes sense (to me).

The documentation can definitely be improved. If you like, you can send a PR and suggest some changes to their repo Welcome to Dune’s Documentation! — Dune documentation

Once I get better accustomed with the ecosystem, I may consider contributing. But I feel like I’m not at that point yet. :sweat_smile:

Hi @jbe This matter is tentatively addressed in the new (draft) tutorial Libraries With Dune , which I have just announced . As @K_N noticed, this wasn’t very well documented.

(Sub)module not found in test when using dune

Learning

yawaramin December 19, 2023, 10:13pm 2

See Using Modules (15 characters long now) - #2 by yawaramin

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