[swift-evolution] [Review] SE-0047 Defaulting non-Void functions so they warn on unused results

[Patrick Pijnappel]

+1 but:

I'm somewhat hesistant about not marking the plausibly discarable ones
@discardableResult.
- I rarely use the result value of removeLast() and I don't see how
requiring it here adds any safety. It is obvious this call has side-effects
and doesn't just return the last element.
- I would say the canonical way to clean-up observers would be to call
removeObservers(self) in deinit to remove all of them at once. Though
arguably not marking it @discardable might have some small safety benefit
here.
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