From 60154d81278533bde2f2bc6b8232ec06b5cda424 Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Wed, 4 Dec 2019 18:26:18 +0000
Subject: [PATCH] SubChunkIteratorManager: assert type of subchunk to make
 PHPStan happy we know this should be a SubChunk, even though it doesn't.

---
 src/world/utils/SubChunkIteratorManager.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/world/utils/SubChunkIteratorManager.php b/src/world/utils/SubChunkIteratorManager.php
index 6a54ccb8d..c79199658 100644
--- a/src/world/utils/SubChunkIteratorManager.php
+++ b/src/world/utils/SubChunkIteratorManager.php
@@ -71,7 +71,9 @@ class SubChunkIteratorManager{
 				return false;
 			}
 
-			$this->currentSubChunk = $this->currentChunk->getSubChunk($y >> 4);
+			$newSubChunk = $this->currentChunk->getSubChunk($y >> 4);
+			assert($newSubChunk instanceof SubChunk, "chunk inside valid bounds should always be a SubChunk instance");
+			$this->currentSubChunk = $newSubChunk;
 			if($this->onSubChunkChangeFunc !== null){
 				($this->onSubChunkChangeFunc)();
 			}