Local Jump Errors

block_test.rb

class T
  def initialize(&block)
    self.class.send(:define_method, :runner, &block)
  end

  def do_stuff
    self.runner do |thing|
      puts thing
    end
  end
end

t = T.new do
  yield "hello, "
  yield "world"
end

begin
  t.do_stuff
rescue LocalJumpError
  puts "LocalJumpError caught"
end

#########################################

class P
  def initialize(runner)
    @runner = runner
  end

  def do_stuff
    @runner.call do |thing|
      puts thing
    end
  end
end

l = lambda do
  yield "proc, "
  yield "hello"
end

p = P.new(l)
p.do_stuff #Also LocalJumpError, wtf!?