[swift-evolution] [planning] [discussion] Schedule for return of closure parameter labels (+ world domination ramble)

Mathew Huusko V mhuusko5 at gmail.com
Fri Aug 4 15:03:20 CDT 2017

Ah, I see. I understood on a basic level that additive features were safe,
but I didn't/don't have the knowledge to judge when adding actually means
changing (e.g. idk, 'adding abstract classes' or 'adding optional protocol
methods' implying 'changing/breaking inheritance/dispatch' or something..).

Anyway, I didn't know that about C++ – now *that's *a reassuring benchmark.
Thanks! ;)

On Fri, Aug 4, 2017 at 8:46 PM, Chris Lattner <clattner at nondot.org> wrote:

> > On Aug 4, 2017, at 12:03 PM, Mathew Huusko V <mhuusko5 at gmail.com> wrote:
> >
> > Thanks for the swift response, it's an honour; I agree wholeheartedly
> with your logic and sentiment. Sorry if I was unclear, but my
> concern/curiosity is not for the speed of Swift's development, but in fact
> for its long term evolution and longevity. At risk of repeating
> myself/boring everyone, that concern manifests over two intermingling
> phenomena:
> > 1) in the evolution email/proposal archive, a well intentioned (towards
> -complexity and +quality) but sometimes blasé air around potential
> uses/requirements of the language (~"Swift won't support that because
> people probably wouldn't use/need it").
> > 2) the reality of the clock, or what I think/thought the reality was.
> Obviously I don't want Swift to evolve too fast, and don't think having any
> particular feature right now is worth risking that, but won't the ABI be
> stabilised eventually (Swift 5?) and then it will actually be too late for
> some features?
> No.  ABI stability is less of a bound of new things than it is a bound on
> the ability to change existing things.
> To take one random example, C++ has been ABI stable on the Mac since
> effectively 10.0 (or whatever release first shipped GCC 3).  That hasn’t
> impeded the ability to add tons of new stuff to C++. :-)
> -Chris
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