> Am 03.12.2017 um 20:08 schrieb Magnus Ahltorp <m...@kth.se>:
>> 4 Dec. 2017 03:54 Thorsten Seitz via swift-evolution 
>> <swift-evolution@swift.org> wrote:
>> The difference is that IUOs are marked by a "!“ whereas dynamic member 
>> lookups look just like normal member lookups but unlike them can fail.
> IUOs are not marked with an "!" by the caller, that's what makes them 
> implicit. They *are* marked at the declaration, but so would dynamic member 
> lookups be.

You are right, my mistake. 

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