Use of 'auto func(int)' before deduction of 'auto' in C++14

Question

I have compiled following program in GCC using C++14.

#include 
using namespace std;

auto func(int i);

int main() 
{
    auto         


        

Answer 1

Clang has a much better error message for that one:

main.cpp:8:16: error: function 'func' with deduced return type cannot be used before it is defined
    auto ret = func(5);
               ^

I guess that's self-explanatory.