https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89537
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #5)
> 89537.C:9:18: error: invalid use of non-static member function ‘void B<
> <template-parameter-1-1>, <template-parameter-1-2>,
> <template-parameter-1-3>, <template-parameter-1-4> >::keys() [with _Tp =
> int; <template-parameter-1-2> = int; <template-parameter-1-3> = A<int>;
> <template-parameter-1-4> = A<int>]’
> 9 | : keys(p1->keys), values(p1->values) {}
> | ~~~~^~~~
> 89537.C:28:8: note: declared here
> 28 | void keys();
> | ^~~~
Much better!
