Refactor vtc: extract to own sub

src/vtc/vmod_frozen.vtc

@@ -28,11 +28,7 @@ varnish v1 -vcl+backend {
     sub vcl_recv {
 	return (synth(200));
     }
-    sub vcl_synth {
-	set resp.http.fail = p_test.parse(req.http.not);
-	set resp.http.parse =
-	  p_test.parse({"{ a: 1, b: "hi there", c: true, d: false, "} +
-	{" e : null, f: [ 1, -2, 3], g: { "1": [], h: [ 7 ] } } "});
+    sub extract {
 	set resp.http.a = p_test.extract(".a");
 	set resp.http.a-type = p_test.type(".a");
 
@@ -68,6 +64,13 @@ varnish v1 -vcl+backend {
 	set resp.http.g = p_test.extract(".g");
 	set resp.http.g-type = p_test.type(".g");
     }
+    sub vcl_synth {
+	set resp.http.fail = p_test.parse(req.http.not);
+	set resp.http.parse =
+	  p_test.parse({"{ a: 1, b: "hi there", c: true, d: false, "} +
+	{" e : null, f: [ 1, -2, 3], g: { "1": [], h: [ 7 ] } } "});
+	call extract;
+    }
 } -start
 
 client c1 {