What the heck is the second one supposed to mean? At first it looks a bit like low <= x <= high but with one comparison operator in the wrong direction. I guess it will first compare a and b evaluating to a boolean value, then implicitly convert this result to an integer and finally compare that to 7 again yielding a boolean value. If you write code like that confusion with the arrow notation is one of your smaller problems.

EDIT: Now I got your point - you could accidentally assign a boolean value to a variable when you intended to create a function. One word - compile time type checking. Okay, four, Übersetzungszeittypprüfung in German.