This little program can freeze your PC ... second time you launch it

error.txt

tableView(-1, [1], [])
2011-03-29 22:53:02.705 macruby[832:903] /Users/penzo/Progetti/faberwork/src/virus.rb:18:in `block': undefined method `delegate=' for 70:Fixnum (NoMethodError)
	from /Users/penzo/Progetti/faberwork/src/virus.rb:52:in `tableView:writeRows:toPasteboard:'
	from /Library/Frameworks/MacRuby.framework/Versions/0.9/usr/lib/ruby/Gems/1.9.2/gems/hotcocoa-0.5.1/lib/hotcocoa/mappings/application.rb:10:in `handle_block:'
	from /Library/Frameworks/MacRuby.framework/Versions/0.9/usr/lib/ruby/Gems/1.9.2/gems/hotcocoa-0.5.1/lib/hotcocoa/mapper.rb:72:in `block'
	from /Users/penzo/Progetti/faberwork/src/virus.rb:17:in `start'
	from /Users/penzo/Progetti/faberwork/src/virus.rb:59:in `<main>'

macruby_hotcocoa_bug.rb

# 1) Launch the app with macruby
# 2) drag a string away from the table
# 2a) You get <error.txt> below
# 3) close the app
# 4) relaunch
# 5) drag again
# 6) ... hard reboot your pc ... ;)


require 'hotcocoa'
include HotCocoa
class Application

  include HotCocoa
  
  def start
    @stuff = [  
      {:name => "Test1"},
      {:name => "Test2"},
      {:name => "Test3"},
      {:name => "Test4"},
      {:name => "Test5"},
    ]

    application :name => "Virus" do |app|
      app.delegate = self
      window :frame => [100, 100, 200, 300], :title => "Virus" do |win|
        @win = win
        win << layout_view(:mode => :vertical, :layout => {:expand => [:width, :height]}) do |view|
          view << scroll_view(:frame => [0, 0, 150, 0], :layout => {:expand => [:height, :width]}) do |scroll|
            scroll << @table = table_view( 
                   :columns => [
                     column(:id => :name, :title => "stuff"), 
                     ],
                   :data => self
                 )
            end
          end
          end
          @win.will_close { exit }
          @table.registerForDraggedTypes([NSStringPboardType, nil])  
          @table.edit_table_column? {|col, row|  false}             
        end
        
  end
    
  def numberOfRowsInTableView(tableView)
    @stuff.length
  end

  def tableView(view, objectValueForTableColumn:column, row:i)
    @stuff[i][column.identifier.intern]
  end
  
   def tableView(view, writeRows: rows, toPasteboard:paste_board)
puts "tableView(#{view.selectedRow}, #{rows.inspect}, #{paste_board.pasteboardItems.inspect})"
  #   data = NSArchiver.archivedDataWithRootObject(3)
   #  p data
     paste_board.declareTypes([NSStringPboardType], owner:nil)
     paste_board.setData("Foo", forType: NSStringPboardType)
     true
   end
  
    
end

Application.new.start