Why might such a strange error occur?

Question

C++ / C#

I have Visual Studio C++ 2013. I am
compiling a third-party program and during compilation a window pops up with the following error:

Compilation stops here. What could it be?
Simplified the code to a minimum:

#include "stdafx.h"
#include <zlib.h>
struct a {
  z_stream_s inflationStream = {};
};

int _tmain(int argc, _TCHAR* argv[])
{
  return 0;
}

ZLib taken from here: https://github.com/madler/zlib

Answer 1

Try setting a different optimization level in the project settings.