[swift-evolution] Change subscripts to use colons

[James Froggatt]

Currently, the signature is:
subscript(_ example: Int) -> Element {
    get { … }
    set { … }
}

The alternative, using a colon, would be:
subscript(_ example: Int) : Element {
    get { … }
    set { … }
}

Sorry if that wasn't clear.

This would be to better reflect the property-like nature of access.

From James F

On 10 Jul 2016, at 23:57, Brent Royal-Gordon <brent at architechies.com> wrote:

>> On Jul 9, 2016, at 11:48 AM, James Froggatt via swift-evolution <swift-evolution at swift.org> wrote:
>> 
>> Subscripts are a hybrid of properties and functions, since they have a parameter list, as well as getters and setters, so use of either symbol will be unusual in this case.
>> 
>> However, I think a colon is more suitable, since it implies the possibility to set the value.
> 
> Can you show us an example of the current syntax and your proposed replacement? I'm not sure what you actually mean by "use colons".
> 
> -- 
> Brent Royal-Gordon
> Architechies
>