Trigger autoloading of a few classes before executing self-update command, fixes #10252

src/Composer/Command/SelfUpdateCommand.php

@@ -79,6 +79,11 @@ EOT
      */
     protected function execute(InputInterface $input, OutputInterface $output)
     {
+        // trigger autoloading of a few classes which may be needed when verifying/swapping the phar file
+        // to ensure we do not try to load them from the new phar, see https://github.com/composer/composer/issues/10252
+        class_exists('Composer\Util\Platform');
+        class_exists('Composer\Downloader\FilesystemException');
+
         $config = Factory::createConfig();
 
         if ($config->get('disable-tls') === true) {