Open Radar

 
Summary:
When an object has a protocol type, attempting to use a class method of its dynamicType causes a segmentation fault. In the playground, Xcode crashes, and in the project, Xcode won't compile.

Sample code:

protocol MyProtocol
{
     class func test() -> String
}

class MyClass: MyProtocol
{
     class func test() -> String
     {
          return "MyClass test"
     }
}

var protocolInstance: MyProtocol = MyClass()
protocolInstance.dynamicType.test() // crashes

Steps to Reproduce:
1. Install Xcode
2. Open a new playground
3. Paste the sample code from the description

Expected Results:
The appropriate class method of the dynamicType should be called.

Actual Results:
Xcode crashes when in a playground or will not compile when in a project due to a segmentation fault.

Version:
Xcode 6 Beta 2, OS X Mavericks
(Also occurs in Xcode 6 Beta 1)

Notes:
One (sloppy) workaround is to duplicate the class method as an instance method. The sample code above would look like this:

protocol MyProtocol
{
     class func test() -> String
     func test() -> String
}

class MyClass: MyProtocol
{
     class func test() -> String
     {
          return "MyClass test"
     }
     func test() -> String
     {
          return MyClass.test()
     }
}

var protocolInstance: MyProtocol = MyClass()
protocolInstance.test() // works fine