1// Copyright 2013 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package bug
6
7type Node interface {
8	Eval(s *Scene)
9}
10
11type plug struct {
12	node Node
13}
14
15type Scene struct {
16	changed map[plug]bool
17}
18