The genie is out of the bottle already, gcc quite sensibly will warn you if it sees an assignment operator in an if statement. I'm sure it's saved countless man hours and pretty awful bugs since it was introduced :-)
Specifically, it doesn't warn you if the assignment statement is in parenthesis, so while ((xs = xs->tail)) doesn't warn. I really like how GCC handles that.
I am aware of the redundancy, this was about the new warnings. If you can't do if(i = getValue()) without warning, I was wondering if assignments as a part of a larger expression would pass.
