[swift-evolution] Passing an optional first argument to sequence(first:next:)

[Tim Vermeulen]

You can’t; the `first` parameter has type `T`, not `T?`.

> On 15 Aug 2016, at 22:10, Maximilian Hünenberger <m.huenenberger at me.com> wrote:
> 
> Hi Tim,
> 
> If you pass "nil" to "first" isn't this an empty sequence? So it would be redundant.
> 
> Best regards
> Maximilian
> 
>> Am 15.08.2016 um 01:27 schrieb Tim Vermeulen via swift-evolution <swift-evolution at swift.org>:
>> 
>> sequence(first:next:) takes a non-optional first argument. Is there a reason for that? sequence(state:next:) allows empty sequences, and I don’t see why sequence(first:next:) shouldn’t. The fix would be to simply add the `?` in the function signature; no other changes are required to make it work.
>> 
>> I considered just filing a bug report, but since this is a change of the public API...
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