[Bug c++/115798] [15 Regression][modules] ICE when re-exporting a type exported from base module's GMF

[m.cencora at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115798

--- Comment #2 from m.cencora at gmail dot com ---
(In reply to m.cencora from comment #1)
> Also this is specific to types exported from GMF, if type is declared
> directly in named module it works fine, i.e.
> 
> $ cat base.cpp 
> export module base;
> 
> export
> {
>     using int8_t = signed char;
> }
> 
> export namespace std
> {
>     using int8_t = ::int8_t;
> }

Scratch that, it actually is not related to GMF.
The above works fine, but following does not:

export module base;

export
{
    using int8_t = signed char;
}

export namespace std
{
    using ::int8_t;
}

So it is a 'new type alias' (OK) vs 'using declaration' (ICE).