diff --git a/tests/ReturnTypeTest.php b/tests/ReturnTypeTest.php
index 7834103df91..1241c9bd110 100644
--- a/tests/ReturnTypeTest.php
+++ b/tests/ReturnTypeTest.php
@@ -1065,6 +1065,29 @@ public function __construct() {
                         }
                     }'
             ],
+            'nestedArrayMapReturnTypeDoesntCrash' => [
+                '<?php
+                    function bar(array $a): array {
+                        return $a;
+                    }
+
+                    /**
+                     * @param array[] $x
+                     *
+                     * @return array[]
+                     */
+                    function foo(array $x): array {
+                        return array_map(
+                            "array_merge",
+                            array_map(
+                                "bar",
+                                $x
+                            ),
+                            $x
+                        );
+                    }
+                ',
+            ],
         ];
     }