gistfile1.txt

ruby-1.9.1-p378 > i = 2
 => 2 
ruby-1.9.1-p378 > p = Proc.new { 
ruby-1.9.1-p378 >     if j == nil
ruby-1.9.1-p378 ?>    j = i
ruby-1.9.1-p378 ?>    end
ruby-1.9.1-p378 ?>  j
ruby-1.9.1-p378 ?>  }
 => #<Proc:0x000001008d7318@(irb):52> 
ruby-1.9.1-p378 > p.call
 => 2 
ruby-1.9.1-p378 > i = 3
 => 3 
ruby-1.9.1-p378 > p.call
 => 3 
ruby-1.9.1-p378 > 

ruby-1.9.1-p378 > i.clone
TypeError: can't clone Fixnum
	from (irb):61:in `clone'
	from (irb):61
	from /Users/dan/.rvm/rubies/ruby-1.9.1-p378/bin/irb:17:in `<main>'
ruby-1.9.1-p378 >