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-rw-r--r--test/fixedbugs/issue35518.go44
1 files changed, 44 insertions, 0 deletions
diff --git a/test/fixedbugs/issue35518.go b/test/fixedbugs/issue35518.go
new file mode 100644
index 0000000..52a0ae7
--- /dev/null
+++ b/test/fixedbugs/issue35518.go
@@ -0,0 +1,44 @@
+// 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
+}