[swift-evolution] Generic Subscripts

[Jacob Bandes-Storch]

On Sat, Jan 14, 2017 at 3:41 PM, Dave Abrahams via swift-evolution <
swift-evolution at swift.org> wrote:

>
> on Fri Jan 13 2017, John McCall <swift-evolution at swift.org> wrote:
>
> > I'm also not sure we'd ever want the element type to be inferred from
> > context like this.  Generic subscripts as I see it are about being
> > generic over *indexes*, not somehow about presenting a polymorphic
> > value.
>
> Actually I *would* want to be able to do that, though I admit it's the
> 1% case (or less).
>

1%? Wouldn't many JSON libraries, for instance, be eager to take advantage
of this?
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