[Bug c++/65399] error: invalid use of non-static data member

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65399

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(Also you should have seen the duplicate bug with *exactly* the same error
message when submitting this one)