SlowPlayground.swift

import UIKit

// Is there a way to "turn off" the Playground on certain lines? Not the same as changing the
// compilation to "manual" -- it's not the compilation that takes the time.

struct SomeThing : Hashable {
    let x : Int
    
    // This line gets updated 22299 times... which takes forever despite showing nothing interesting!
    var hashValue: Int { get { return x } }
}

func ==(lhs : SomeThing, rhs : SomeThing) -> Bool {
    return lhs.x == rhs.x
}

var x : [SomeThing:Int] = [:]
for a in 1...10000 {
    x[SomeThing(x: a)] = a
}

x.count

@sdarlington can you put it in another Swift file in the playground?