5/6 chance of never exiting

results.txt

2.2.0 :001 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):1:in `call'
	from (irb):1:in `new'
	from (irb):1:in `block in irb_binding'
	from (irb):1:in `loop'
	from (irb):1
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :002 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):2:in `call'
	from (irb):2:in `new'
	from (irb):2:in `block in irb_binding'
	from (irb):2:in `loop'
	from (irb):2
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :003 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):3:in `call'
	from (irb):3:in `block (2 levels) in irb_binding'
	from (irb):3:in `call'
	from (irb):3:in `block in irb_binding'
	from (irb):3:in `loop'
	from (irb):3
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :004 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):4:in `call'
	from (irb):4:in `new'
	from (irb):4:in `block in irb_binding'
	from (irb):4:in `loop'
	from (irb):4
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :005 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):5:in `call'
	from (irb):5:in `block (2 levels) in irb_binding'
	from (irb):5:in `call'
	from (irb):5:in `block in irb_binding'
	from (irb):5:in `loop'
	from (irb):5
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :006 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):6:in `call'
	from (irb):6:in `rand'
	from (irb):6:in `block in irb_binding'
	from (irb):6:in `loop'
	from (irb):6
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :007 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
^CIRB::Abort: abort then interrupt!
	from (irb):7:in `call'
	from (irb):7:in `new'
	from (irb):7:in `block in irb_binding'
	from (irb):7:in `loop'
	from (irb):7
	from /home/rth/.rvm/rubies/ruby-2.2.0/bin/irb:11:in `<main>'
2.2.0 :008 > @proc = Proc.new { break }; loop { rand(6) == 0 ? x = "lucky" : @proc = Proc.new { x = "unlucky" }; @proc.call }
 => nil 

unlucky.rb

@proc = Proc.new { break }; loop { rand(6) == 0 ? "lucky" : @proc = Proc.new { puts "unlucky" }; @proc.call }

Failed to exit 7/8 times.