[Bug c++/96877] Erroneous warning when default initializing function pointer types defined using std::declval

[insertinterestingnamehere at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96877

--- Comment #3 from Ian Henriksen <insertinterestingnamehere at gmail dot com> ---
The goal of doing it that way was get the exception specification onto the
pointer type in C++11 and C++14. The intent was to get the equivalent of

typedef void(*function_type)(void*) noexcept;

but with standards earlier than C++17.