Function func_handle

include/pybind11/functional.h:25–29

This triggers a syntax error under very special conditions (very weird indeed).

#if !(defined(_MSC_VER) && _MSC_VER == 1916 && defined(PYBIND11_CPP17))
    // This triggers a syntax error under very special conditions (very weird indeed).
    explicit
#endif
        func_handle(function &&f_) noexcept
        : f(std::move(f_)) {
    }
    func_handle(const func_handle &f_) { operator=(f_); }
    func_handle &operator=(const func_handle &f_) {
        gil_scoped_acquire acq;