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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Converter/HookUserLogin.php b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Converter/HookUserLogin.php
new file mode 100644
index 000000000..70c47826b
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Converter/HookUserLogin.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Converter;
+
+use Drupal\Component\Plugin\PluginManagerInterface;
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\drupalmoduleupgrader\ConverterBase;
+use Drupal\drupalmoduleupgrader\TargetInterface;
+use Pharborist\DocCommentNode;
+use Pharborist\Types\ArrayNode;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @Converter(
+ *  id = "hook_user_login",
+ *  description = @Translation("Alters signatures of hook_user_login() implementations."),
+ *  hook = "hook_user_login",
+ *  dependencies = { "plugin.manager.drupalmoduleupgrader.rewriter" }
+ * )
+ */
+class HookUserLogin extends ConverterBase {
+
+  /**
+   * @var \Drupal\Component\Plugin\PluginManagerInterface
+   */
+  protected $rewriters;
+
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, TranslationInterface $translator, LoggerInterface $log, PluginManagerInterface $rewriters) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $translator, $log);
+    $this->rewriters = $rewriters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function convert(TargetInterface $target) {
+    /** @var \Pharborist\Functions\FunctionDeclarationNode $function */
+    $function = $target->getIndexer('function')->get('hook_user_login');
+    // The $edit parameter is defunct in Drupal 8, but we'll leave it in
+    // there as an empty array to prevent errors, and move it to the back
+    // of the line.
+    /** @var \Pharborist\Functions\ParameterNode $edit */
+    $edit = $function->getParameterList()->shift()->setReference(FALSE)->setValue(ArrayNode::create([]));
+    $function->appendParameter($edit);
+
+    // Slap a FIXME on the hook implementation, informing the developer that
+    // $edit and $category are dead.
+    $comment = $function->getDocComment();
+    $comment_text = $comment ? $comment->getCommentText() : '';
+    if ($comment_text) {
+      $comment_text .= "\n\n";
+    }
+    $comment_text .= <<<'END'
+@FIXME
+The $edit parameter is gone in Drupal 8. It has been left here in order to
+prevent 'undefined variable' errors, but it will never actually be passed to
+this hook. You'll need to modify this function and remove every reference to it.
+END;
+    $function->setDocComment(DocCommentNode::create($comment_text));
+
+    $rewriter = $this->rewriters->createInstance('_rewriter:user');
+    $this->rewriteFunction($rewriter, $function->getParameterAtIndex(0), $target);
+    $target->save($function);
+  }
+
+}