I saw someone point out that these identifier restrictions mean that a valid C compiler optimization would be to change all instances of "x = to[a-z]+(y);" to "

I saw someone point out that these identifier restrictions mean that a valid C compiler optimization would be to change all instances of "x = to[a-z]+(y);" to "if (!is[a-z]+(y)) x = to[a-z]+(y);" Not that any compiler would actually be absurd enough to implement this, of course :) Naturally, this would imply the validity of the optimization: x = toilet(y); -> if (!isilet(y)) x = toilet(y);