[Bug c++/63458] myclassobj >> charac compiles without warning, EVEN though ONLY operator>>(std::string&) exists

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63458

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
You forgot to mark your operator bool as explicit.