[swift-evolution] Proposal: Add generator functions to the language

[Andrey Tarantsov]

> Another possible syntax, inspired by "throws".
> 
> func foo() yield -> String

Well, again, yielding is an implementation detail. What's the advantage vs returning Generator<String>? I don't think that lying about the return type is useful for anyone.

> I'm not sure what happens if a function both yields and throws.

An excellent question. We'd need another generator type with "next() throws".

A.

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