[swift-evolution] Proposal: Add syntactic sugar for iterating over an Optional<SequenceType>

[Marco Masser]

>
> FWIW, the above only works when "array" is an array or set.  In a generic
> context you might not even know how to construct an empty one.
>
Right. And for types that don't conform to ArrayLiteralConvertible or
DictionaryLiteralConvertible, there's no chance to do a shortcut like that.

a?.forEach { object in ... }
>
> is the generic version I think.
>

Unfortunately, this prevents break/continue from being very readable in the
"loop" body (IMHO) and doesn't allow a return out of the enclosing function
at all. But yeah, at least that works on any Optional<SequenceType>.
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