undefined method `yscrollcommand' for nil:NilClass (NoMethodError)

[Siep Kroonenberg]

Binary package hint: ruby1.9

Ubuntu release: Karmic
Package version: 1.9.0.5-1ubuntu

I expected the Ruby/Tk test script at the end to run the same as under Ruby1.8 and Ruby1.9.1. Instead, it came back with the message:

ruby1.9 ./crash19a.rb
./crash19a.rb:12:in `block (3 levels) in <main>': undefined method `yscrollcommand' for nil:NilClass (NoMethodError)
 from ./crash19a.rb:9:in `new'
 from ./crash19a.rb:9:in `block (2 levels) in <main>'
 from /usr/lib/ruby/1.9.0/tk/text.rb:262:in `instance_eval'
 from /usr/lib/ruby/1.9.0/tk/text.rb:262:in `new'
 from ./crash19a.rb:8:in `block in <main>'
 from ./crash19a.rb:7:in `new'
 from ./crash19a.rb:7:in `<main>'

This is the test script:

#!/usr/bin/ruby

require 'tk'

root = TkRoot.new()

t = TkToplevel.new( root ) { |tl|
  TkText.new( tl ) { |tx|
    TkScrollbar.new( tl ) { |s|
      pack( 'side' => 'right', 'fill' => 'y' )
      command proc{ |*args| t.yview(*args) }
      tx.yscrollcommand proc{ |first, last| s.set first, last }
    }
    pack( 'expand'=>'yes', 'fill'=>'both' )
    insert( '0.0', "This window is a text widget." )
  }
  TkButton.new( tl ) {
    text 'Leave'
    command proc{ tl.withdraw; root.focus }
    pack
  }
  withdraw
}

TkButton.new( root ) {
  text 'Popup'
  command proc{ t.deiconify }
  pack
}

TkButton.new( root ) {
  text 'Quit'
  command proc{ root.destroy }
  pack
}

Tk.mainloop