Visual Studio C++ compiler weird behaviour

Question

I\'m just curious to know why this small piece of code compiles correctly (and without warnings) in Visual Studio. Maybe the result is the same with GCC and Clang,

Answer 1

Because it defines a variable of type T:

http://coliru.stacked-crooked.com/a/d420870b1a6490d7

#include 

struct T {
    int t;
    T() : t(0) {}
};

int main() {
    T(i_do_not_exist);
    i_do_not_exist.t = 120;
    std::cout << i_do_not_exist.t;
    return 0;
}

The above example looks silly, but this syntax is allowed for a reason.

A better example is:

int func1();
namespace A
{
   void func1(int);
   struct X {
       friend int (::func1)();
   };
}

Probably other examples could be found.