https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58820
TC <rs2740 at gmail dot com> changed:
What |Removed |Added
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CC| |rs2740 at gmail dot com
--- Comment #3 from TC <rs2740 at gmail dot com> ---
This should be closed as invalid. The lookup for `operator()` is indeed
ambiguous, (see [class.member.lookup]/6 - the merge produces an invalid set),
and GCC correctly reports it as such.
In the absence of using-declarations, names from different base classes don't
overload.
