[release-branch.go1.3] runtime: fix defer of nil func

??? CL 105140044 / c2832405e9b9
runtime: fix defer of nil func

Fixes issue 8047.

LGTM=r, iant
R=golang-codereviews, r, iant
CC=dvyukov, golang-codereviews, khr
https://codereview.appspot.com/105140044
???

LGTM=r
R=golang-codereviews, r
CC=adg, golang-codereviews, iant
https://codereview.appspot.com/103370044

1 files changed, 22 insertions, 0 deletions

diff --git a/test/fixedbugs/issue8047b.go b/test/fixedbugs/issue8047b.go
new file mode 100644
index 000000000..de6acaab5
--- /dev/null
+++ b/test/fixedbugs/issue8047b.go
@@ -0,0 +1,22 @@
+// run
+
+// Copyright 2014 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.
+
+// Issue 8047. Defer setup during panic shouldn't crash for nil defer.
+
+package main
+
+func main() {
+	defer func() {
+		recover()
+	}()
+	f()
+}
+
+func f() {
+	var g func()
+	defer g()
+	panic(1)
+}