https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83264
--- Comment #9 from Fedor Chelnokov <fchelnokov at gmail dot com> --- There is a related discussion: https://stackoverflow.com/a/47618530/7325599 And it is noted there that according to [over.ics.rank]/2 just before [over.ics.rank]/3: — a standard conversion sequence is a better conversion sequence than a user-defined conversion
