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// errorcheck -0 -l -m=2
// 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.
// This test makes sure that -m=2's escape analysis diagnostics don't
// go into an infinite loop when handling negative dereference
// cycles. The critical thing being tested here is that compilation
// succeeds ("errorcheck -0"), not any particular diagnostic output,
// hence the very lax ERROR patterns below.
package p
type Node struct {
Orig *Node
}
var sink *Node
func f1() {
var n Node // ERROR "."
n.Orig = &n
m := n // ERROR "."
sink = &m
}
func f2() {
var n1, n2 Node // ERROR "."
n1.Orig = &n2
n2 = n1
m := n2 // ERROR "."
sink = &m
}
func f3() {
var n1, n2 Node // ERROR "."
n1.Orig = &n1
n1.Orig = &n2
sink = n1.Orig.Orig
}
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