allow routes to have the same name as fallback components - fixes #4186 (#4284)

Author: Rich-Harris

.changeset/long-guests-trade.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Allow routes with the same name as fallback components

packages/kit/src/core/build/build_server.js

@@ -160,7 +160,7 @@ export async function build_server(
 		const relative = path.relative(config.kit.files.routes, resolved);
 
 		const name = relative.startsWith('..')
-			? posixify(path.join('entries/pages', path.basename(file)))
+			? posixify(path.join('entries/fallbacks', path.basename(file)))
 			: posixify(path.join('entries/pages', relative));
 		input[name] = resolved;
 	});

packages/kit/test/apps/options/source/pages/error.svelte

@@ -0,0 +1 @@
+<!-- https://github.com/sveltejs/kit/issues/4186 -->