Mark do you have suggestions for Dave?

> On Aug 9, 2017, at 11:22 AM, David Zarzycki via swift-dev 
> <swift-dev@swift.org> wrote:
> 
> 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?
> 

This is part of a larger internal test.

> 
>> On Aug 9, 2017, at 14:04, Arnold Schwaighofer <notificati...@github.com 
>> <mailto: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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> 
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