Adding upstream version 1.21.8.upstream/1.21.8

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

1 files changed, 26 insertions, 0 deletions

diff --git a/test/fixedbugs/issue25516.go b/test/fixedbugs/issue25516.go
new file mode 100644
index 0000000..8326ef9
--- /dev/null
+++ b/test/fixedbugs/issue25516.go
@@ -0,0 +1,26 @@
+// compile
+
+// Copyright 2018 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.
+
+// Make sure dead write barriers are handled correctly.
+
+package main
+
+func f(p **int) {
+	// The trick here is to eliminate the block containing the write barrier,
+	// but only after the write barrier branches are inserted.
+	// This requires some delicate code.
+	i := 0
+	var b []bool
+	var s string
+	for true {
+		if b[i] {
+			var a []string
+			s = a[len(s)]
+			i = 0
+		}
+		*p = nil
+	}
+}