diff --git a/test/fixedbugs/issue15604.go b/test/fixedbugs/issue15604.go
new file mode 100644
index 0000000000..4dc0b0b054
--- /dev/null
+++ b/test/fixedbugs/issue15604.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2016 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 bug
+
+import "os"
+
+func f(err error) {
+	var ok bool
+	if err, ok = err.(*os.PathError); ok {
+		if err == os.ErrNotExist {
+		}
+	}
+}