Add method that reflection doesn’t know exists

src/Psalm/Internal/Stubs/CoreGenericClasses.php

@@ -750,6 +750,8 @@ class DOMNodeList implements Traversable, Countable {
  */
 class SplDoublyLinkedList implements Iterator, Countable, ArrayAccess, Serializable
 {
+    public function __construct() {}
+
     /**
      * Add/insert a new value at the specified index
      * @param TKey $index The index where the new value is to be inserted.

tests/Template/TemplateTest.php

@@ -1479,6 +1479,20 @@ class TemplateTest extends TestCase
                         return a($type);
                     }',
             ],
+            'doublyLinkedListConstructor' => [
+                '<?php
+                    $list = new SplDoublyLinkedList();
+                    $list->add(5, "hello");
+                    $list->add("hello", 5);
+
+                    /** @var SplDoublyLinkedList<int, string> */
+                    $templated_list = new SplDoublyLinkedList();
+                    $templated_list->add(5, "hello");
+                    $a = $templated_list->bottom();',
+                [
+                    '$a' => 'string',
+                ]
+            ],
         ];
     }
 
@@ -1931,6 +1945,13 @@ class TemplateTest extends TestCase
                     function violate($p) {}',
                 'error_message' => 'InvalidTemplateParam',
             ],
+            'doublyLinkedListBadParam' => [
+                '<?php
+                    /** @var SplDoublyLinkedList<int, string> */
+                    $templated_list = new SplDoublyLinkedList();
+                    $templated_list->add(5, []);',
+                'error_message' => 'InvalidArgument',
+            ],
         ];
     }
 }