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

[Joe Groff]

> On Aug 27, 2017, at 10:57 AM, Edward Connell via swift-users <swift-users at swift.org> wrote:
> 
> 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.

What was the SR or radar number?

-Joe

> 
> 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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