https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114990
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
bar.cppm:4:20: error: conflicting declaration of ‘void foo()’ in module ‘bar’
4 | export inline void foo() noexcept;
| ^~~
In file included from bar.cppm:2:
someheader.hpp:1:13: note: previously declared in global module
