[swift-evolution] Initializers

[David Hart]

> On 30 Jan 2017, at 23:08, Joe Groff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Jan 30, 2017, at 12:36 PM, Robert Widmann via swift-evolution <swift-evolution at swift.org> wrote:
>> 
>> This seems to contradict Swift’s goal of being safe by default, no?  It would make me incredibly uncomfortable if there were a backdoor in DI, even if that backdoor emitted traps when it fails.
> 
> There already is a backdoor of sorts. This is one of the intended use cases for implicitly-unwrapped optionals. If you don't want to be hassled by DI, declare a property as T! type, and it will be implicitly initialized to nil, and trap if you try to use it as an unwrapped T without initializing it first.

And we've been trying to close that door 🚪 :)

> -Joe
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