Open Radar

 
Summary:
Typing this simple Linked List node class into a Playground file in Xcode6-Beta2 crashes Xcode.

Steps to Reproduce:
1. Open Xcode6-Beta2
2. Show the Welcome to Xcode window and choose "Get started with a playground"
3. Enter this code into the playground:

class LinkedListNode<T> {
    var item: T
    var next: LinkedListNode? = nil
    
    init(item: T) {
        self.item = item
    }
}


Expected Results:
Xcode does not crash

Actual Results:
Xcode crashes when completing the line reading "self.item = item"

Regression:
n/a (also happened in the first Xcode6-Beta release)

Notes:
Running the swift code on the command line yields the following error:

$ swift -i ~/Desktop/LinkedList.playground/section-1.swift
/Users/simon/Desktop/LinkedList.playground/section-1.swift:4:9: error: unimplemented IR generation feature non-fixed class layout
    var item: T
        ^
LLVM ERROR: unimplemented IRGen feature! non-fixed class layout