[swift-evolution] Pitch: Remove default initialization of optional bindings

[T.J. Usiyan]

I used the existence of the first one in my explanation of explain
optionals. "There is a reasonable default value for an optional type.
'nothing'."

TJ

On Mon, Nov 6, 2017 at 6:52 PM, Slava Pestov via swift-evolution <
swift-evolution at swift.org> wrote:

>
>
> On Nov 6, 2017, at 4:29 PM, Kelvin Ma <kelvin13ma at gmail.com> wrote:
>
> hot take: i use the second one a lot but only because i always forget the
> first one exists. So I type the = nil just to “be sure”.
>
>
> Yeah, that’s one of my arguments against having the feature, along with
> the simple fact that if the language did not have it already, nobody would
> be requesting this to be added as a special case for optionals.
>
> However, since I also want to avoid needless source compatibility churn,
> I’m fine with keeping the feature — it’s not a huge burden to maintain
> (unlike, say, AnyObject dispatch :) )
>
> Slava
>
>
> On Mon, Nov 6, 2017 at 4:33 PM, Slava Pestov via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> Hi all,
>>
>> Right now, the following two declarations are equivalent:
>>
>> struct S {
>>   var x: Int?
>> }
>>
>> struct S {
>>   var x: Int? = nil
>> }
>>
>> That is, mutable bindings of sugared optional type (but not Optional<T>!)
>> always have a default value of ‘nil’. This feature increases the surface
>> area of the language for no good reason, and I would like to deprecate it
>> in -swift-version 5 with a short proposal. Does anyone feel strongly about
>> giving it up? I suspect most Swift users don’t even know it exists.
>>
>> Slava
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>> swift-evolution at swift.org
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>>
>
>
>
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