https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98642
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
$ ./cc1plus -quiet 98642.C
98642.C: In instantiation of ‘C& bar() [with C = const foo]’:
98642.C:19:25: required from here
98642.C:13:12: error: use of deleted function ‘base::base(base&&)’
13 | static C c{};
| ^
98642.C:4:3: note: declared here
4 | base(base &&) = delete;
| ^~~~
