https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100443
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to gnzlbg from comment #0) > A member using declaration brings into the derived class all the overloads > of the specified function from the given base class, except for any > overloads where the derived class has a function declaration with the same > signature ([namespace.udecl]/p11). Which standard are you referring to?