Testing what happens when returning out of a block

return_test.rb

module Klass
  def self.counter
    Thread.current[:counter] ||= 0
  end

  def self.counter=(value)
    Thread.current[:counter] = value
  end

  def self.yield_with_counter
    self.counter += 1
    yield
  ensure
    self.counter -= 1
  end

  def self.measure
    ret = nil

    puts self.counter
    yield_with_counter do
      ret = yield
    end
    puts self.counter

    ret
  end
end

def testing
  puts 'out'
  Klass.measure do
    puts 'in'

    return 3

    puts 'post'
  end
  puts 'double-post'
end

puts testing