[Bug c++/100583] [modules] ICE when importing <span>

[johelegp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100583

--- Comment #4 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> ---
As pointed out in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103118#c3:

> What works is including them in a non-module unit translation unit.
> 
> ```C++
> #if defined(__GNUC__) and not defined(__clang__)
> #  include <chrono> // Workaround GCC bug 103118.
> #  include <span>   // Workaround GCC bug 100583.
> #endif
> import waarudo.geometries;
> import waarudo.numbers;
> import waarudo.quantities;
> #include <cassert>
> ```