Issue #1894840 by dcrocks, larowlan: Fixed regression - main menu not shown on front page.

core/modules/system/lib/Drupal/system/Plugin/block/block/SystemMenuBlock.php

@@ -29,7 +29,7 @@ class SystemMenuBlock extends BlockBase {
   public function blockAccess() {
     // @todo The 'Tools' menu should be available to anonymous users.
     list($plugin, $derivative) = explode(':', $this->getPluginId());
-    return ($GLOBALS['user']->uid || in_array($derivative, array('menu-tools', 'menu-footer')));
+    return ($GLOBALS['user']->uid || in_array($derivative, array('menu-main', 'menu-tools', 'menu-footer')));
   }
 
   /**

core/profiles/standard/lib/Drupal/standard/Tests/StandardTest.php

@@ -32,6 +32,22 @@ function testStandard() {
     $this->assertLink(t('Contact'));
     $this->clickLink(t('Contact'));
     $this->assertResponse(200);
+
+    // Test anonymous user can access 'Main navigation' block.
+    $admin = $this->drupalCreateUser(array('administer blocks'));
+    $this->drupalLogin($admin);
+    // Configure the block.
+    $this->drupalGet('admin/structure/block/add/system_menu_block:menu-main/bartik');
+    $this->drupalPost(NULL, array(
+      'region' => 'sidebar_first',
+      'machine_name' => 'main_navigation',
+    ), t('Save block'));
+    // Verify admin user can see the block.
+    $this->drupalGet('');
+    $this->assertText('Main navigation');
+    // Verify anonymous user can see the block.
+    $this->drupalLogout();
+    $this->assertText('Main navigation');
   }
 
 }