[Bug c++/118049] conflicting global module declaration

[furyusss at yahoo dot fr via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118049

--- Comment #1 from furyusss at yahoo dot fr ---
Adding the content of the attached files here so it is easier to read:

```
module1.cpp
    module;

    #include <memory>

    export module module1;

module2.cpp
    module;

    #include <thread>

    export module module2;

    import module1;

module2_impl.cpp
    module;

    #include <string>

    module module2;
```