| // Copyright 2021 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package a | |
| type Node interface { | |
| Position() | |
| } | |
| type noder struct{} | |
| func (noder) Position() {} | |
| type Scope map[int][]Node | |
| func (s Scope) M1() Scope { | |
| if x, ok := s[0]; ok { | |
| return x[0].(struct { | |
| noder | |
| Scope | |
| }).Scope | |
| } | |
| return nil | |
| } | |
| func (s Scope) M2() Scope { | |
| if x, ok := s[0]; ok { | |
| st, _ := x[0].(struct { | |
| noder | |
| Scope | |
| }) | |
| return st.Scope | |
| } | |
| return nil | |
| } |