Open Radar

 
In the attached code, I have two classes, Base and Derived, and some very simple code to exercise them, printing a result that should eventually be generated by the "Derived" class. In a command-line project, if I have all the code together in a single file, the result is what I expect; both println statements output "Derived contents, dynamically generated".

However, if I take the Base and Derived class definitions, and put them in their own files, making no other changes, then I get "Derived contents, dynamically generated", followed by "Base contents", indicating that the wrong getter is being called.

Steps to Reproduce:
1. Take the code in "single_file", attached, and put it in a new Xcode OS X command-line utility Swift project.
2. Run it.
3. Cut and paste the code for the "Derived" class out into a new file called "derived.swift"
4. Cut and paste the code for the "Base" class out into a new file called "derived.swift"
5. (At this point, you should have code that looks like the "split_across_files" folder, attached)
6. Re-run the project. 
7. Observe difference in output

Expected Results:
I'd expect that in both cases, the Derived class's setter would be used, resulting in "Derived contents, dynamically generated" to appear twice.

Actual Results:
With the code in a single source file, I get the expected results. With the code split across three source files, I get "Derived contents, dynamically generated", followed by "Base contents", which seems to indicate that the wrong getter is being called.

Version:
Xcode Version 6.0 (6A215l)
OS X 10.9.4 Build 13E9

Notes:
First observed while investigating this Stack Overflow question: http://stackoverflow.com/questions/24135741/calling-a-subclasss-getter-in-swift/24136038?noredirect=1#comment37248938_24136038

Configuration:


Attachments:


------
//
//  main.swift
//  derivation
//
//  Created by Matt Gibson on 10/06/2014.
//  Copyright (c) 2014 Matt Gibson Creative. All rights reserved.
//

import Foundation

class Base {
    var contents = "Base contents"
    var description: String {
    get {
        return self.contents
    }
    }
}

class Derived : Base {
    override var contents: String {
    get {
        return "Derived contents, dynamically generated"
    }
    set { }
    }
}

let d = Derived()
println(d.contents) // Prints "Derived contents, dynamically generated"
println(d.description) // Prints "Derived contents, dynamically generated" if single source file, "Base contents" if classes above are split out into their own files.