More xref coverage testing

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4746 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/v00021.vtc

@@ -50,3 +50,22 @@ varnish v1 -badvcl {
 
 }
 
+varnish v1 -badvcl {
+	backend b { .host = "127.0.0.1"; }
+
+	sub foo {
+	}
+}
+
+
+varnish v1 -badvcl {
+	backend b { .host = "127.0.0.1"; }
+
+	sub vcl_recv {
+		call foo;
+	}
+
+	sub foo {
+		return (deliver);
+	}
+}