[swift-users] Using #function causes big memory leak

[Edward Connell via swift-users]

I reported this about a year ago, but it has never been fixed and it seems
like it should be fixed for the Swift 4.0 release.

Here is a simple repro case. If you watch the memory monitor as it runs,
you see memory consumption climb to 2.7GB when using #function, and no
memory increase when using a static string.

import Foundation

class A {
var counter = 0 {
// didSet { onSet("counter") }  // no leak
didSet { onSet() }  // huge leak
}

var properties = ["counter" : 0]
func onSet(_ name: String = #function) {
properties[name]! += 1
}
}

var myclass = A()

for i in 0..<10000000 {
myclass.counter = i
}

print(myclass.properties["counter"]!)

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