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-rw-r--r--test/fixedbugs/issue43570.go40
1 files changed, 40 insertions, 0 deletions
diff --git a/test/fixedbugs/issue43570.go b/test/fixedbugs/issue43570.go
new file mode 100644
index 0000000..d073fde
--- /dev/null
+++ b/test/fixedbugs/issue43570.go
@@ -0,0 +1,40 @@
+// run
+
+// 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 main
+
+import "fmt"
+
+type T [8]*int
+
+//go:noinline
+func f(x int) T {
+ return T{}
+}
+
+//go:noinline
+func g(x int, t T) {
+ if t != (T{}) {
+ panic(fmt.Sprintf("bad: %v", t))
+ }
+}
+
+func main() {
+ const N = 10000
+ var q T
+ func() {
+ for i := 0; i < N; i++ {
+ q = f(0)
+ g(0, q)
+ sink = make([]byte, 1024)
+ }
+ }()
+ // Note that the closure is a trick to get the write to q to be a
+ // write to a pointer that is known to be non-nil and requires
+ // a write barrier.
+}
+
+var sink []byte