sorted-routes: fix "an required" → "a required" grammar in catch-all error

packages/next/errors.json

@@ -1162,5 +1162,6 @@
   "1161": "\"unstable_prefetch\" is a route segment config and can only be used when the segment is a Server Component module. Remove the \"use client\" directive from \"%s\" to use this API.",
   "1162": "Route \"%s\" cannot use \\`export const unstable_instant = ...\\` without enabling \\`cacheComponents\\`.",
   "1163": "Unexpected cache miss after cache warming phase during prerendering. This is likely caused by non-deterministic arguments that differ between the cache warming phase and the final prerender phase (e.g. unstable array order). Ensure that arguments passed to cached functions are deterministic.",
-  "1164": "Response body exceeded maximum size of %s bytes"
+  "1164": "Response body exceeded maximum size of %s bytes",
+  "1165": "You cannot use both a required and optional catch-all route at the same level (\"[...%s]\" and \"%s\" )."
 }

packages/next/src/shared/lib/router/utils/sorted-routes.ts

@@ -154,7 +154,7 @@ class UrlNode {
         if (isOptional) {
           if (this.restSlugName != null) {
             throw new Error(
-              `You cannot use both an required and optional catch-all route at the same level ("[...${this.restSlugName}]" and "${urlPaths[0]}" ).`
+              `You cannot use both a required and optional catch-all route at the same level ("[...${this.restSlugName}]" and "${urlPaths[0]}" ).`
             )
           }
 

test/unit/page-route-sorter.test.ts

@@ -172,7 +172,7 @@ describe('getSortedRoutes', () => {
     expect(() =>
       getSortedRoutes(['/[...one]', '/[[...one]]'])
     ).toThrowErrorMatchingInlineSnapshot(
-      `"You cannot use both an required and optional catch-all route at the same level ("[...one]" and "[[...one]]" )."`
+      `"You cannot use both a required and optional catch-all route at the same level ("[...one]" and "[[...one]]" )."`
     )
     expect(() =>
       getSortedRoutes(['/[[...one]]', '/[...one]'])