one odd thing reading through was the comment that A benefit of lazy evaluation is that you can write code like an Icon or Python generator that spins forever,

one odd thing reading through was the comment that A benefit of lazy evaluation is that you can write code like an Icon or Python generator that spins forever, returning a value on each cycle, and it will only be called for the exact number of returns that the enclosing program actually needs even if the caller is itself a generator. that sounds to me like it's making a contrast with icon and python generators. but, as far as i understand things, that's just the same as icon + python. also, "even if..." was emphasised, and i don't understand why. i suspect i've misread it or am missing something. would someone be kind enough to set me straight? thanks...