Any tips on how to debug performance regressions?

And as aside, if this test is critical enough to cause a revert, why isn’t it 
in the public repo?


> On Aug 9, 2017, at 14:04, Arnold Schwaighofer <notificati...@github.com> 
> wrote:
> 
> Hi Dave,
> I have reverted this commit because it broke internal bots.
> 
> import Foundation
> class P {
>     var x : Int = 0
>     var y : Int = 1
> }
> 
> let dist : (P, P) -> Double = {
>   (p : P, s : P)  -> Double in
>     sqrt(Double((p.x-s.x)*(p.x-s.x) + (p.y-s.y)*(p.y-s.y)))
> }
> fails now with expression to complex.
> 
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