require 'sandbox'
require 'pp'

module Interface
  def self.mputs(*s)
    puts(*s)
  end
end

box=Sandbox.safe
pp box
box.ref Interface
box.eval("def self.a;\nInterface::mputs 123\nend\n self.a")
box.eval('self.a')

normal=Sandbox.new
normal.eval("a=12")
pp normal.eval("a")

s=Sandbox.safe
s.eval("a=12")
pp s.eval("a")



s=Sandbox.safe
s.ref Interface
s.eval("$a=12")
pp s.eval("$a")