[Bug c++/67247] ICE on std::forward args&& inside nested lambda function

[tower120 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67247

tower120 <tower120 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |6.0

--- Comment #4 from tower120 <tower120 at gmail dot com> ---
Reduced case [Forwarding captured variadic arguments inside lambda] :
https://godbolt.org/g/D7lXEA

template<typename... T>
int g(T... t)
{
    return 0;
}

template<class... Args>
void f(Args&&... args)
{    
    auto lm = [&](auto&&..._args) { 
        auto f = [&]{g(std::forward<decltype(_args)>(_args)...);};
      //auto f = [&]{g(_args...);}; /* THIS ONE OK */
        return f(); 
    };
    lm(args...);
}

int main()
{
    f(2, 5, 7);
}

Error "_args was not declared" on 4.9.x
ICE on 5.x
Ok on 6.x