[TypeDeclaration] Handle UnitEnum not exists check on ParamTypeByParentCallTypeRector (#841)

build/target-repository/bootstrap.php

@@ -36,3 +36,16 @@ spl_autoload_register(function (string $class): void {
         }
     }
 });
+
+if (! interface_exists('UnitEnum')) {
+    /**
+     * @since 8.1
+     */
+    interface UnitEnum
+    {
+        /**
+         * @return static[]
+         */
+        public static function cases(): array;
+    }
+}

rules-tests/TypeDeclaration/Rector/ClassMethod/ParamTypeByParentCallTypeRector/Fixture/extends_exception.php.inc

@@ -0,0 +1,13 @@
+<?php
+
+class SomeException extends \Exception
+{
+    protected $message = '';
+
+    public function __construct($message = '', $code = 0, $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+        $this->message = $message;
+        $this->code = $code;
+    }
+}

stubs/Php/UnitEnum.php

@@ -11,8 +11,6 @@ if (interface_exists('UnitEnum')) {
  */
 interface UnitEnum
 {
-    public string $name;
-
     /**
      * @return static[]
      */