I'm currently porting some "C99"-ish code, and I had a few instances for which I would have loved just use C11's `_Generic` to replace a macro-hell with stateme

I'm currently porting some "C99"-ish code, and I had a few instances for which I would have loved just use C11's `_Generic` to replace a macro-hell with statement expressions and accompanying `typeof()`s all over the place. Fun fact: `typeof` is a GNU extension, and the target compiler doesn't have that.