RubyMotion runtime freeze on syntax error in an `each` block, when called from a callback

README.md

Hello everyone,

I've already asked on IRC and no one seemed to have an idea why the following is happening:

I can consistently get the RubyMotion runtime and the device to freeze when running this simple code (https://gist.github.com/2936457) with rake device and then hitting the Cancel button on the UIImagePicker. I am guessing this is related to callbacks in general, but I couldn't come up with a simpler example.

As you can see, the UIImagePicker callback method simply uses each to iterate over an array of strings, but as soon as it hits the syntax error on line 28 (putd) it stops. No exception in the logs, nothing. The process has to be killed to exit it.

Any ideas? Am I supposed to release/retain something? I know blocks are a bit tricky but I can't figure out what could possibly be causing the freeze, even if it was a NULL pointer or a missing reference

app_delegate.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(HelloViewController.alloc.init)
    @window.rootViewController.wantsFullScreenLayout = true
    @window.makeKeyAndVisible
    true
  end
end

class HelloViewController < UIViewController
  def loadView
    self.view = UIView.alloc.init
  end

  def viewDidLoad
    imagePicker = UIImagePickerController.alloc.init
    imagePicker.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary
    imagePicker.delegate = self
    presentViewController(imagePicker, animated:true, completion:nil)
  end

  def imagePickerControllerDidCancel(picker)
    puts "imagePickerControllerDidCancel #{picker.inspect}"
    
    ['item1','item2'].each do |item|
      puts "item is #{item}"
      putd "This line will throw a syntax error, as expected"
      puts "This line is never reached (nor does the application exit)"
    end
    picker.presentingViewController.dismissModalViewControllerAnimated(true)
  end

end