cmd/gc: fix inlining bug with receive operator.
The receive operator was given incorrect precedence
resulting in incorrect deletion of parentheses.
Fixes #3843.
R=rsc
CC=golang-dev, remy
https://golang.org/cl/6442049
diff --git a/test/fixedbugs/bug448.go b/test/fixedbugs/bug448.go
new file mode 100644
index 0000000..242f599
--- /dev/null
+++ b/test/fixedbugs/bug448.go
@@ -0,0 +1,7 @@
+// compiledir
+
+// Copyright 2012 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 ignored
