Use the argument provided workspace, rather than default to req->ws.

bin/varnishd/cache/cache_vrt.c

@@ -215,14 +215,14 @@ VRT_String(struct ws *ws, const char *h, const char *p, va_list ap)
  */
 
 const char *
-VRT_ReqString(struct req *req, const char *p, ...)
+VRT_CollectString(struct ws *ws, const char *p, ...)
 {
 	va_list ap;
 	char *b;
 
-	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	CHECK_OBJ_NOTNULL(ws, WS_MAGIC);
 	va_start(ap, p);
-	b = VRT_String(req->ws, NULL, p, ap);
+	b = VRT_String(ws, NULL, p, ap);
 	va_end(ap);
 	return (b);
 }

include/vrt.h

@@ -232,4 +232,4 @@ char *VRT_TIME_string(struct ws *, double);
 const char *VRT_BOOL_string(unsigned);
 const char *VRT_BACKEND_string(const struct director *d);
 
-const char *VRT_ReqString(struct req *, const char *p, ...);
+const char *VRT_CollectString(struct ws *, const char *p, ...);

lib/libvcl/vcc_expr.c

@@ -914,7 +914,7 @@ vcc_expr_strfold(struct vcc *tl, struct expr **e, enum var_type fmt)
 
 	if (fmt != STRING_LIST && (*e)->fmt == STRING_LIST)
 		*e = vcc_expr_edit(STRING,
-		    "\v+VRT_ReqString(req,\n\v1,\nvrt_magic_string_end)",
+		    "\v+VRT_CollectString(ws,\n\v1,\nvrt_magic_string_end)\v-",
 		    *e, NULL);
 	if (fmt == STRING_LIST && (*e)->fmt == STRING)
 		(*e)->fmt = STRING_LIST;