unexport Func and Expr
diff --git a/shellutil_test.go b/shellutil_test.go
index e4c200d..39c2c64 100644
--- a/shellutil_test.go
+++ b/shellutil_test.go
@@ -69,7 +69,7 @@
 			if b.name != "shell-date" && b.name != "shell-date-quoted" {
 				continue
 			}
-			m, ok := matchExpr(Expr{tc.sharg}, b.pattern)
+			m, ok := matchExpr(expr{tc.sharg}, b.pattern)
 			if !ok {
 				t.Logf("%s not match with %s", b.name, tc.sharg)
 				continue