[swift-evolution] Strings in Swift 4

[Joe Groff]

> On Jan 20, 2017, at 5:15 PM, Ben Cohen via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Jan 20, 2017, at 3:29 PM, Jaden Geller via swift-evolution <swift-evolution at swift.org> wrote:
>> 
>> Wouldn’t `x[…]` be more consistent with these other syntaxes?
>> 
> 
> Maybe (though are those extra characters really telling you much?). 
> 
> But you can’t write that in Swift – you’d need a 0-argument operator.
> 
> (Or a […] postfix operator I guess if you wanted to try and sneak that through, but that is also not allowed…  :)

Technically, you can, since operators are function values:

struct Foo {}
struct Woo { subscript(_: (Foo, Foo) -> Foo) -> Int { return 0 } }
func ...(_ x: Foo, _ y: Foo) -> Foo { return x }

Woo()[...]

Whether you *want* to, though…

-Joe
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