[swift-evolution] Default Generic Arguments

[David Sweeris]

> On Jan 24, 2017, at 15:33, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> 
> As I replied above, this doesn't work IMO because omitted generic arguments are inferred, and that can't change without being hugely source-breaking.
> 
> I think it's absolutely essential that adding a default to my library doesn't change the behavior of code that uses my library. That's currently the case, afaict, for all default arguments, and so I think it's essential here.

There is a difference, though, in that default values can't be inferred... Simply adding a default value for a function argument can't change the behavior of anything because, prior to adding it, any code that didn't provide that value wouldn't have compiled.

- Dave Sweeris 
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