I'm running into a weird issue when trying to get rid of functors for platform-dependent parts of my library in favor of virtual libraries. I've distilled down my codebase down to this project to illustrate the problem: https://github.com/Lupus/virtual-lib-issue

lib folder has 2 libraries, a and b, a has one virtual module, and one ordinary module, b depends on a and calls function from ordinary module.

lib-unix folder includes a, which is an implementation for a virtual library from lib folder.

examples contains an executable which calls function from b, which in turn calls function from a.

When I try to build the executable, I get the following error:

File "_none_", line 1:
Error: No implementations provided for the following modules:
         A__Real_module referenced from lib/b/b.cmxa(B__Foo)

I'm a bit lost on why this happens.

OCaml version is 4.06.1, dune 1.11.0.

Any help on this is greatly appreciated.