cmd/gc: make embedded, unexported fields read-only.

Fixes issue 7363.

LGTM=gri
R=gri, rsc, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/66510044

1 files changed, 26 insertions, 0 deletions

diff --git a/test/fixedbugs/issue7363.go b/test/fixedbugs/issue7363.go
new file mode 100644
index 000000000..726396a7c
--- /dev/null
+++ b/test/fixedbugs/issue7363.go
@@ -0,0 +1,26 @@
+// 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 7363: CanSet must return false for unexported embedded struct fields.
+
+package main
+
+import "reflect"
+
+type a struct {
+}
+
+type B struct {
+	a
+}
+
+func main() {
+	b := &B{}
+	v := reflect.ValueOf(b).Elem().Field(0)
+	if v.CanSet() {
+		panic("B.a is an unexported embedded struct field")
+	}
+}