proc_fix.rb

require 'rubygems'
require 'metaid'

class Video
  attr_reader :unreachable

  def initialize
    @unreachable = 'cant read this'
  end

  def another_method
    'cant call this'
  end

  def custom_array
    variable = 'cant touch this'
    the_array = [1,2,3]
    p = Proc.new do
      [variable, @unreachable, another_method]
    end
    the_array.meta_def :mthd do
      p.call
    end
    the_array
  end
end

v = Video.new
puts v.custom_array.mthd.inspect