Compiler Crash on Implementing Optional convenience init of CGMutablePath

new-host-4:SignalGH glenn$ swift
Welcome to Apple Swift version 3.0 (swiftlang-800.0.42.1 clang-800.0.36.1). Type :help for assistance.
  1> import CoreGraphics
  2>  
  3> extension CGMutablePath 
  4. { 
  5.     public func addSVGPath(svgPath: String) -> Bool 
  6.     { 
  7.         return true 
  8.     } 
  9.      
 10.     public convenience init?(svgPath: String) 
 11.     { 
 12.         self.init() 
 13.         self.addSVGPath(svgPath: svgPath) 
 14.     } 
 15. } 

Bus error: 10