         _internalErrors += errors
         cancel()
     }
-
-    // MARK: - Cancellation
 
     public override func cancel() {
         if !finished {


public extension Operation {

    // MARK: - Dependencies

    private func createDidFinishDependenciesOperation() -> NSOperation {
        assert(waitForDependenciesOperation == nil, "Should only ever create the finishing dependency once.")
        let __op = NSBlockOperation { }

        // No op.
    }

    // MARK: - Cancellation

    /**
     Cancel the operation with an error.

