Issue #2551259 by Mile23, gaurav.kapoor, Jo Fitzgerald, googletorp, Jeremy,...

Issue #2551259 by Mile23, gaurav.kapoor, Jo Fitzgerald, googletorp, Jeremy, xjm, webchick: Deprecate dead code locale_translation_manual_status()

core/modules/locale/locale.pages.inc

@@ -13,9 +13,14 @@
  *
  * Manually checks the translation status without the use of cron.
  *
- * @see locale_menu()
+ * @deprecated in Drupal 8.5.0 and will be removed before 9.0.0. It is unused by
+ *   Drupal core. Duplicate this function in your own extension if you need its
+ *   behavior.
+ *
+ * @see https://www.drupal.org/node/2931188
  */
 function locale_translation_manual_status() {
+  @trigger_error('locale_translation_manual_status() is deprecated in Drupal 8.5.0 and will be removed before Drupal 9.0.0. It is unused by Drupal core. Duplicate this function in your own extension if you need its behavior.', E_USER_DEPRECATED);
   module_load_include('compare.inc', 'locale');
 
   // Check the translation status of all translatable projects in all languages.

core/modules/locale/tests/src/Kernel/LocaleDeprecationsTest.php

+<?php
+
+namespace Drupal\Tests\locale\Kernel;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests deprecations in the locale module.
+ *
+ * @group locale
+ * @group legacy
+ */
+class LocaleDeprecationsTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['locale', 'system'];
+
+  /**
+   * @expectedDeprecation locale_translation_manual_status() is deprecated in Drupal 8.5.0 and will be removed before Drupal 9.0.0. It is unused by Drupal core. Duplicate this function in your own extension if you need its behavior.
+   */
+  public function testLocaleTranslationManualStatusDeprecation() {
+    module_load_include('pages.inc', 'locale');
+    $this->assertNotNull(\locale_translation_manual_status());
+  }
+
+}