> 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.


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