Open Radar

 
Summary:
When running the following code in a Xcode 6.1 GM seed and 6.1 b2 swift playground for OS X there is a crash.

====
import Cocoa

class BaseClass {
    let classDescription: String
    init(description: String) {
        self.classDescription = description
    }
    func description() -> String { return self.classDescription }
}

class SubClass1 : BaseClass {
    init() {
        super.init(description: "subclass1")
    }
}

class SubClass2 : BaseClass {
    init() {
        super.init(description: "subclass2")
    }
}

let classMapping = ["subclass1": SubClass1.self, "subclass2": SubClass2.self]
let myClass = classMapping["subclass1"]
====

Steps to Reproduce:
Create an OS X swift playground paste in the code in the description section between the ==== and then see the crash on the line creating the dictionary.

Expected Results:
That it doesn't crash. That the classMapping const is of type [String:BaseClass.Type].

Actual Results:
I get a crash with the following output:
* thread #1: tid = 0x366b, 0x00000001024b4a65 libswiftCore.dylib`swift_getSummary + 37, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x68)
  * frame #0: 0x00000001024b4a65 libswiftCore.dylib`swift_getSummary + 37
    frame #1: 0x0000000102590b8c libswiftCore.dylib`-[SwiftObject debugDescription] + 92
    frame #2: 0x000000010275bb40 libswiftFoundation.dylib`protocol witness for Swift.MirrorType.summary.getter : Swift.String in conformance Foundation._ObjCMirror : Swift.MirrorType + 64
    frame #3: 0x0000000102327f3b PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.getSummaries (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.Bool) -> (brief : Swift.String, long : Swift.String) + 171
    frame #4: 0x000000010232a963 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructuredImpl (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, Swift.Array<Swift.Range<Swift.UInt64>>...) -> () + 867
    frame #5: 0x0000000102326c4a PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructured (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, PlaygroundLogger.LoggerCappingPolicy) -> () + 1562
    frame #6: 0x0000000102327263 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructured (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64) -> () + 323
    frame #7: 0x000000010232d5c0 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encode (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64) -> () + 7776
    frame #8: 0x0000000102327deb PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeChildren (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, Swift.Range<Swift.UInt64>) -> () + 2203
    frame #9: 0x000000010232b301 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructuredImpl (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, Swift.Array<Swift.Range<Swift.UInt64>>...) -> () + 3329
    frame #10: 0x0000000102326a68 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructured (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, PlaygroundLogger.LoggerCappingPolicy) -> () + 1080
    frame #11: 0x00000001023273bf PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeStructured (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64) -> () + 671
    frame #12: 0x000000010232d5c0 PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encode (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64) -> () + 7776
    frame #13: 0x0000000102327deb PlaygroundLogger`PlaygroundLogger.PlaygroundObjectWriter.encodeChildren (PlaygroundLogger.PlaygroundObjectWriter)(Swift.MirrorType, Swift.UInt64, Swift.Range<Swift.UInt64>) -> () + 2203
    frame #14: 0x000000010232b301 PlaygroundLogger`PlaygroundLogg

Version:
Xcode 6.1 beta 2, and Xcode 6.1 beta 3. Swift playground for OSX.

Notes:


Configuration:
15" MBP non Retina. 16GByte Ram. 500GByte SSD drive.