[swift-evolution] [Pitch] Expanded type category constraints

[Brent Royal-Gordon]

> On Oct 27, 2016, at 4:15 AM, David Sweeris via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I keep losing track of what exactly constitutes "ABI stability and resilience"

ABI stability can generally be thought of as "anything that affects how APIs **that exist today** are represented in machine code". That includes features which will lead to binary-incompatible standard library redesigns, which is why we're working on things like conditional conformance.

I don't think a feature like this would qualify unless there are standard library interfaces we would redesign to use the new constraints.

-- 
Brent Royal-Gordon
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