[Bug c++/120611] New: Name of lambda member exposed

[ethanhancock at me dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120611

            Bug ID: 120611
           Summary: Name of lambda member exposed
           Product: gcc
           Version: 15.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ethanhancock at me dot com
  Target Milestone: ---

https://godbolt.org/z/TaGbYr33r

GCC accepts the following:

int main() {
  auto l = [](){ return 42; };
  return l._FUN();
}

The static member _FUN is exposed and usable.
This does not require instantiation of the lambda type; the following is
accepted in c++20 mode:

int main() {
 return decltype([]{return 42;})::_FUN();
}