ah hello my old friend, impossible-generics.neon

propagating generics all the way through the likes of HandlerList etc is more trouble than it's worth.

tests/phpstan/configs/impossible-generics.neon

@@ -1,5 +1,15 @@
 parameters:
 	ignoreErrors:
+		-
+			message: "#^Method pocketmine\\\\event\\\\AsyncRegisteredListener\\:\\:__construct\\(\\) has parameter \\$handler with no signature specified for Closure\\.$#"
+			count: 1
+			path: ../../../src/event/AsyncRegisteredListener.php
+
+		-
+			message: "#^Method pocketmine\\\\event\\\\AsyncRegisteredListener\\:\\:getHandler\\(\\) return type has no signature specified for Closure\\.$#"
+			count: 1
+			path: ../../../src/event/AsyncRegisteredListener.php
+
 		-
 			message: "#^Method pocketmine\\\\event\\\\RegisteredListener\\:\\:__construct\\(\\) has parameter \\$handler with no signature specified for Closure\\.$#"
 			count: 1

tests/plugins/TesterPlugin/src/AsyncEventInheritanceTest.php

@@ -39,6 +39,9 @@ final class AsyncEventInheritanceTest extends Test{
 		ChildAsyncEvent::class,
 		ParentAsyncEvent::class
 	];
+	/**
+	 * @var string[]
+	 */
 	private array $callOrder = [];
 
 	public function getName() : string{