From 7245af7c60609231b95e5bc7a74e529a7c7beead Mon Sep 17 00:00:00 2001
From: TheGreatAlgo <37487508+TheGreatAlgo@users.noreply.github.com>
Date: Fri, 7 Jul 2023 23:44:52 +0200
Subject: [PATCH] fix: error message

---
 src/werkzeug/routing/rules.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/werkzeug/routing/rules.py b/src/werkzeug/routing/rules.py
index d65dce0283..4f983f334e 100644
--- a/src/werkzeug/routing/rules.py
+++ b/src/werkzeug/routing/rules.py
@@ -454,7 +454,7 @@ def __init__(
         websocket: bool = False,
     ) -> None:
         if not string.startswith("/"):
-            raise ValueError("urls must start with a leading slash:", string)
+            raise ValueError(f"urls must start with a leading slash: {string!r}")
         self.rule = string
         self.is_leaf = not string.endswith("/")
         self.is_branch = string.endswith("/")