module Implicit
    def my_yield(val, &block)
        b = eval("self", block.binding)

        eigen = class << b; self; end

        b.instance_eval {It = val}

        my_proc = lambda { val }

        eigen.send(:define_method, :_, my_proc)

        yield

        eigen.send(:remove_method, :_)

    end
end


class Object
  include Implicit
end

def hello
   my_yield(10, &Proc.new)
end


hello { puts(It * 2) }