[Bug c++/65354] Converting lambda to pointer results in double destruction

[charlie at charliedyson dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65354

--- Comment #2 from Charlie <charlie at charliedyson dot net> ---
Here's a more succinct example (using the "+" trick to convert to a function
pointer):

#include <iostream>

int main ()
{
    auto f = +[] (std::string s)
    {
      return std::string (std::move (s));
    };
    std::string s ("hello");
    f (std::move (s));
}