diff --git a/core/scripts/switch-psr4.sh b/core/scripts/switch-psr4.sh
deleted file mode 100644
index d9c4e1c391c99045248fcf8dcd4e36efe3eca560..0000000000000000000000000000000000000000
--- a/core/scripts/switch-psr4.sh
+++ /dev/null
@@ -1,321 +0,0 @@
-#!/bin/php
-<?php
-
-namespace Drupal\Core\SwitchPsr4;
-
-/**
- * @file
- * Moves module-provided class files to their PSR-4 location.
- *
- * E.g.:
- * core/modules/action/{lib/Drupal/action → src}/ActionAccessControlHandler.php
- * core/modules/action/{lib/Drupal/action → src}/ActionAddForm.php
- */
-
-// Determine DRUPAL_ROOT.
-$dir = dirname(__FILE__);
-while (!defined('DRUPAL_ROOT')) {
-  if (is_dir($dir . '/core')) {
-    define('DRUPAL_ROOT', $dir);
-  }
-  $dir = dirname($dir);
-}
-
-// Run the script.
-run();
-
-/**
- * Runs the script.
- */
-function run() {
-  $cmd_arguments = $_SERVER['argv'];
-  // The first argument is the script name.
-  $scriptname = array_shift($cmd_arguments);
-  if (in_array('--help', $cmd_arguments)) {
-    print get_help_text($scriptname);
-  }
-  elseif (!empty($cmd_arguments)) {
-    // If one or more arguments are given, treat those arguments as directories,
-    // and process all modules found within these directories.
-    $directories = array();
-    foreach ($cmd_arguments as $arg) {
-      if ('-' === $arg{0}) {
-        // The only valid option is '--help'.
-        print "Invalid option '$arg'";
-        return;
-      }
-      if (!is_dir($arg)) {
-        print "The argument '$arg' is not a directory.";
-        continue;
-      }
-      $directories[] = $arg;
-    }
-    // Process all directories that were found in the argument list.
-    foreach ($directories as $dir) {
-      process_candidate_dir($dir);
-    }
-  }
-  else {
-    // If no arguments are given, process all modules and profiles in the core
-    // directories instead.
-    process_candidate_dir(DRUPAL_ROOT . '/core/modules');
-    process_candidate_dir(DRUPAL_ROOT . '/core/profiles');
-  }
-}
-
-/**
- * @param string $scriptname
- *
- * @return string
- *   Help text in case the "--help" option is present.
- */
-function get_help_text($scriptname) {
-  $script = basename($scriptname);
-  return <<<EOF
-
-Move module class files from PSR-0 to PSR-4.
-
-E.g. the following files would be moved.
-  - core/modules/action/{lib/Drupal/action → src}/ActionListController.php
-  - core/modules/action/tests/{Drupal/action/Tests → src}/Menu/ActionLocalTasksTest.php
-
-Class files which are already in the PSR-4 path remain where they are.
-
-Warning: Classes with an underscore in the class name (after the last namespace
-separator) will end up in an incorrect location, and need to be fixed manually.
-Such class names are not allowed in Drupal coding standards, but they may still
-occur in some custom and contrib modules.
-
-The script takes any number of arguments which, if present, specify the
-directories to scan for modules and module class files.
-
-If no arguments are given, the following directories will be processed:
-  - core/modules/
-  - core/profiles/
-
-See:
-  - https://drupal.org/node/2083547 Drupal issue
-  - https://drupal.org/node/2156625 Documentation of PSR-4 in Drupal
-
-Usage:        {$script} [OPTIONS] [DIRECTORIES]
-Examples:     {$script}
-              {$script} core/modules/views
-              {$script} modules/contrib modules/custom
-              {$script} modules/contrib/devel
-
-Options:
-  --help      Display this help page and exit.
-
-
-EOF;
-}
-
-/**
- * Scans all subdirectories of a given directory for Drupal extensions, and runs
- * process_extension() for each one that it finds.
- *
- * @param string $dir
- *   A directory whose subdirectories could contain Drupal extensions.
- */
-function process_extensions_base_dir($dir) {
-  /**
-   * @var \DirectoryIterator $fileinfo
-   */
-  foreach (new \DirectoryIterator($dir) as $fileinfo) {
-    if ($fileinfo->isDot()) {
-      // do nothing
-    }
-    elseif ($fileinfo->isDir()) {
-      process_candidate_dir($fileinfo->getPathname());
-    }
-  }
-}
-
-/**
- * Recursively scans a directory for Drupal extensions, and runs
- * process_extension() for each one that it finds.
- *
- * @param string $dir
- *   A directory that could be a Drupal extension directory.
- */
-function process_candidate_dir($dir) {
-  /**
-   * @var \DirectoryIterator $fileinfo
-   */
-  foreach (new \DirectoryIterator($dir) as $fileinfo) {
-    if ($fileinfo->isDot()) {
-      // Ignore "." and "..".
-    }
-    elseif ($fileinfo->isDir()) {
-      // It's a directory.
-      switch ($fileinfo->getFilename()) {
-        case 'lib':
-        case 'src':
-          // Ignore these directory names.
-          continue;
-        default:
-          // Look for more extensions in subdirectories.
-          process_candidate_dir($fileinfo->getPathname());
-      }
-    }
-    else {
-      // It's a file.
-      if (preg_match('/^(.+).info.yml$/', $fileinfo->getFilename(), $m)) {
-        // It's a *.info.yml file, so we found an extension directory.
-        $extension_name = $m[1];
-      }
-    }
-  }
-  if (isset($extension_name)) {
-    process_extension($extension_name, $dir);
-    process_extension_phpunit($extension_name, $dir);
-  }
-}
-
-/**
- * Process a Drupal extension (module, theme) in a directory.
- *
- * This will move all class files in this extension from
- * lib/Drupal/$extension_name/$path to src/$path.
- *
- * @param string $name
- *   Name of the extension.
- * @param string $dir
- *   Directory of the extension.
- * @throws \Exception
- */
-function process_extension($name, $dir) {
-
-  if (!is_dir($source = "$dir/lib/Drupal/$name")) {
-    // Nothing to do in this module.
-    return;
-  }
-
-  if (!is_dir($destination = "$dir/src")) {
-    mkdir($destination);
-  }
-
-  // Move class files two levels up.
-  move_directory_contents($source, $destination);
-
-  // Clean up.
-  require_dir_empty("$dir/lib/Drupal");
-  rmdir("$dir/lib/Drupal");
-  require_dir_empty("$dir/lib");
-  rmdir("$dir/lib");
-}
-
-/**
- * Process a Drupal extension (module, theme) in a directory.
- *
- * This will move all PHPUnit class files in this extension from
- * tests/Drupal/$name/Tests/ to tests/src/.
- *
- * @param string $name
- *   Name of the extension.
- * @param string $dir
- *   Directory of the extension.
- */
-function process_extension_phpunit($name, $dir) {
-
-  if (!is_dir($source = "$dir/tests/Drupal/$name/Tests")) {
-    // Nothing to do in this module.
-    return;
-  }
-
-  if (!is_dir($dest = "$dir/tests/src")) {
-    mkdir($dest);
-  }
-
-  // Move class files two levels up.
-  move_directory_contents($source, $dest);
-
-  // Clean up.
-  require_dir_empty("$dir/tests/Drupal/$name");
-  rmdir("$dir/tests/Drupal/$name");
-  require_dir_empty("$dir/tests/Drupal");
-  rmdir("$dir/tests/Drupal");
-}
-
-/**
- * Move directory contents from an existing source directory to an existing
- * destination directory.
- *
- * @param string $source
- *   An existing source directory.
- * @param string $destination
- *   An existing destination directory.
- *
- * @throws \Exception
- */
-function move_directory_contents($source, $destination) {
-
-  if (!is_dir($source)) {
-    throw new \Exception("The source '$source' is not a directory.");
-  }
-
-  if (!is_dir($destination)) {
-    throw new \Exception("The destination '$destination' is not a directory.");
-  }
-
-  /**
-   * @var \DirectoryIterator $fileinfo
-   */
-  foreach (new \DirectoryIterator($source) as $fileinfo) {
-    if ($fileinfo->isDot()) {
-      continue;
-    }
-    $dest_path = $destination . '/' . $fileinfo->getFilename();
-    if (!file_exists($dest_path)) {
-      rename($fileinfo->getPathname(), $dest_path);
-    }
-    elseif ($fileinfo->isFile()) {
-      throw new \Exception("Destination '$dest_path' already exists, cannot overwrite.");
-    }
-    elseif ($fileinfo->isDir()) {
-      if (!is_dir($dest_path)) {
-        throw new \Exception("Destination '$dest_path' is not a directory.");
-      }
-      move_directory_contents($fileinfo->getPathname(), $dest_path);
-    }
-  }
-
-  require_dir_empty($source);
-
-  rmdir($source);
-}
-
-/**
- * Throws an exception if a directory is not empty.
- *
- * @param string $dir
- *   Directory to check.
- *
- * @throws \Exception
- */
-function require_dir_empty($dir) {
-  if (is_file($dir)) {
-    throw new \Exception("The path '$dir' is a file, when it should be a directory.");
-  }
-  if (!is_dir($dir)) {
-    throw new \Exception("The directory '$dir' does not exist.");
-  }
-  if (!is_readable($dir)) {
-    throw new \Exception("The directory '$dir' is not readable.");
-  }
-  /**
-   * @var \DirectoryIterator $fileinfo
-   */
-  foreach (new \DirectoryIterator($dir) as $fileinfo) {
-    if ($fileinfo->isDot()) {
-      continue;
-    }
-    $path = $fileinfo->getPathname();
-    if ($fileinfo->isFile()) {
-      throw new \Exception("File '$path' found in a directory that should be empty.");
-    }
-    elseif ($fileinfo->isDir()) {
-      throw new \Exception("Subdirectory '$path' found in a directory that should be empty.");
-    }
-  }
-}