--- composer-2.5.1a/src/bootstrap.php   2022-12-22 15:33:54.000000000 +0100
+++ composer-2.5.1/src/bootstrap.php    2023-02-19 23:15:40.433041600 +0100
@@ -12,7 +12,7 @@

 use Composer\Autoload\ClassLoader;

-function includeIfExists(string $file): ?ClassLoader
+function includeIfExists(string $file)
 {
     return file_exists($file) ? include $file : null;
 }