[swift-evolution] Obsoleting `if let`

[Chris Lattner]

> On Feb 3, 2016, at 8:02 PM, David Waite <david at alkaline-solutions.com> wrote:
> 
> -1 , as it changes the meaning of ‘!’ from ‘fault program on error’ to mere flow control. 
> 
> I’m surprised nobody has beat me to suggesting the interrobang, though.

Random factoid, but we briefly discussed how logical it would be if the ImplicitlyUnwrappedOptional sugar were T‽ instead of T!… :-)

-Chris