> On Aug 3, 2016, at 1:16 AM, Brent Royal-Gordon via swift-dev
> <swift-dev@swift.org> wrote:
>
>> On Jul 29, 2016, at 5:55 PM, Jacob Bandes-Storch via swift-evolution
>> <swift-evolut...@swift.org> wrote:
>>
>> • a top-of-file "shebang"-style comment indicating the version,
>> something like //#swift(4), mirroring the "#if swift" syntax
>
> `import Swift 3.1`?
>
> I think this brings up two interesting questions:
>
> * Do we want to be able to mix files using different versions of Swift in the
> same module?
No. It simplifies the problem greatly if the whole module is compiled with a
single Swift version.
> * Do we want to extend these backwards compatibility features beyond the
> standard library to other modules?
If we can design generally-useful features for handling language versioning,
that the standard library can adopt, that would be great.
- Doug
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