diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index 1c398ef43c..80fdc55b5d 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -211,6 +211,7 @@ func walkstmt(n *Node) *Node {
 		ODCLCONST,
 		ODCLTYPE,
 		OCHECKNIL,
+		OVARDEF,
 		OVARKILL,
 		OVARLIVE:
 		break
diff --git a/test/fixedbugs/issue28055.go b/test/fixedbugs/issue28055.go
new file mode 100644
index 0000000000..d4889d54d4
--- /dev/null
+++ b/test/fixedbugs/issue28055.go
@@ -0,0 +1,16 @@
+// 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 VARDEF can be a top-level statement.
+
+package p
+
+func f() {
+	var s string
+	var as []string
+	switch false && (s+"a"+as[0]+s+as[0]+s == "") {
+	}
+}