Open Radar

 
Summary:
The provided set of protocols and extensions causes a segmentation fault 11

Steps to Reproduce:
1. paste the following code into a new file in Xcode. 
2. Build (The build should succeed.) 
3. Uncomment out the extension on Double. 
4. Build. (Segmentation fault)


/// BEGIN CODE SNIPPET
public protocol TimeType : Comparable {
    typealias Context
    func absoluteTimeInterval(context:Context) -> AbsoluteTimeInterval
}

public protocol AbsoluteTimeType : TimeType {
    var absoluteTimeInterval:AbsoluteTimeInterval { get }
}


public typealias AbsoluteTimeInterval = Double

// Uncomment this method and then buildThe pro
//extension Double : AbsoluteTimeType {
//    public var absoluteTimeInterval: Double {
//        return self
//    }
//}

extension AbsoluteTimeType {
    typealias Context = Void
    public func absoluteTimeInterval(context: Void = ()) -> AbsoluteTimeInterval {
        return absoluteTimeInterval
    }
}

/// END CODE SNIPPET

Expected Results:
A successful build, errors, or warnings.

Actual Results:
Segmentation fault 11

Regression:
No segmentation fault is encountered when building with Xcode 7.0 from the Mac App Store.