[Bug c++/97712] Attribute nodiscard in virtual methods is ignored

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97712

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Looks like we don't track attributes properly for OBJ_TYPE_REFs in
maybe_warn_nodiscard.