From f8db5a0461045db909dd027789a26b827fd69ec2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maximilian=20B=C3=B6sing?=
 <2189546+boesing@users.noreply.github.com>
Date: Tue, 17 Aug 2021 18:16:37 +0200
Subject: [PATCH] bugfix: enable `ClassLikes` to properly detect implementing
 class aliases
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Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>
---
 src/Psalm/Internal/Codebase/ClassLikes.php | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/Psalm/Internal/Codebase/ClassLikes.php b/src/Psalm/Internal/Codebase/ClassLikes.php
index 6559f49a6..bb59ef9b4 100644
--- a/src/Psalm/Internal/Codebase/ClassLikes.php
+++ b/src/Psalm/Internal/Codebase/ClassLikes.php
@@ -26,6 +26,7 @@ use Psalm\Storage\ClassLikeStorage;
 use Psalm\Type;
 use ReflectionProperty;
 
+use function array_keys;
 use function array_merge;
 use function array_pop;
 use function count;
@@ -675,7 +676,23 @@ class ClassLikes
         }
         $class_storage = $this->classlike_storage_provider->get($fq_class_name);
 
-        return isset($class_storage->class_implements[$interface_id]);
+        if (isset($class_storage->class_implements[$interface_id])) {
+            return true;
+        }
+
+        foreach (array_keys($class_storage->class_implements) as $implementing_interface_lc) {
+            if (!isset($this->classlike_aliases[$implementing_interface_lc])) {
+                continue;
+            }
+
+            $aliased_interface_lc = strtolower($this->classlike_aliases[$implementing_interface_lc]);
+
+            if ($aliased_interface_lc === $interface_id) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     public function interfaceExists(