Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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