[Bug middle-end/104958] missing -Wdangling-pointer leaking local address through struct member

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104958

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A C++ example with lamdbas which shows the same issue here (the IR is basically
the same):

int outer;
auto fn1(int val = 0){
  return [&]{
    outer = val; // invalid
  };
}