gistfile1.rb

def method_missing(meth, *args)
  i = 0
  attributes = args.map do
    i += 1
    "var#{i}"
  end

  st = Struct.new("TempVar", *attributes).new

  target_inst = eval('self', @binding)

  i = 1
  while target_inst.respond_to? "__tmp_slate#{i}".to_sym
    i += 1
  end
  method = "__tmp_slate#{i}".to_sym

  target_inst.instance_eval "def #{method}; @#{method}; end"
  target_inst.instance_eval "def #{method}=(val); @#{method}=val; end"

  i = 0
  eval_args = []
  args.each do |a|
    i += 1
    st["var#{i}"] = a
    eval_args << "#{method}['var#{i}']"
  end

  target_inst.send "#{method}=", st

  eval_string = "%s(%s)" % [meth, eval_args.join(",")]
  eval(eval_string, @binding)
end