https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120894
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to m.cencora from comment #0)
> Also not sure why but ~memory_resource is not-defined inline,
The header has a comment saying why:
virtual ~memory_resource(); // key function
We don't want the vtable to be emitted in every translation unit.
