examples.rb

# Allows you to easily make a full closure in ruby
# Examples:

def bork
  x = 'abc'
  closure { x }
end

f = bork
f.call
# => 'abc'

f.call << ' def'
# => 'abc def'

f.call
# => 'abc def'

g = bork
g.call
# => 'abc'

f.call
# => 'abc def'

kernel_ext.rb

module Kernel
  def closure &body
    klass = class << self; self; end
    klass.class_exec(body) do |body|
      define_method('', &body) #.tap { remove_method('') }
    end
  end
end