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// Copyright 2019 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 A interface {
M(i interface{}) interface{}
}
var a1 A
var a2 A
func V(p A, k, v interface{}) A {
defer func() { a1, a2 = a2, a1 }()
return a1
}
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