On 02.09.21 09:10, Malcolm Cohen via J3 wrote: > As Van said, the alternatives to op= are trivial. Assume that f is a function that returns a value depending on the number of its invocations, then a(f(i)) = a(f(i)) + b could mean something different than a(f(i)) += b or not. Either way, it would have to be defined what happens.