[Bug c++/58820] lambda multiple inheritance operator() not ambiguous

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58820

--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Barring further comments, I'm going to add a testcase and close this.
(Note, current clang still accepts it)