Does syntactic sugar have to be that strictly limited? If we are allowed to manipulate the statement block containing the sugared expression, we could define a

Does syntactic sugar have to be that strictly limited? If we are allowed to manipulate the statement block containing the sugared expression, we could define a trivial helper function which performs the 'nonlocal' side-effect and returns the value. Then, replace the "x := y" with "helper(y)".