1 files changed, 35 insertions, 0 deletions
diff --git a/test/fixedbugs/issue4909a.go b/test/fixedbugs/issue4909a.go
new file mode 100644
index 0000000..27ae294
--- /dev/null
+++ b/test/fixedbugs/issue4909a.go
@@ -0,0 +1,35 @@
+// errorcheck
+
+// Copyright 2013 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 4909: compiler incorrectly accepts unsafe.Offsetof(t.x)
+// where x is a field of an embedded pointer field.
+
+package p
+
+import (
+	"unsafe"
+)
+
+type T struct {
+	A int
+	*B
+}
+
+func (t T) Method() {}
+
+type B struct {
+	X, Y int
+}
+
+var t T
+var p *T
+
+const N1 = unsafe.Offsetof(t.X)      // ERROR "indirection|field X is embedded via a pointer in T"
+const N2 = unsafe.Offsetof(p.X)      // ERROR "indirection|field X is embedded via a pointer in T"
+const N3 = unsafe.Offsetof(t.B.X)    // valid
+const N4 = unsafe.Offsetof(p.B.X)    // valid
+const N5 = unsafe.Offsetof(t.Method) // ERROR "method value"
+const N6 = unsafe.Offsetof(p.Method) // ERROR "method value"