From 1dd945d7b3fbcd3ff0c80f58b5fa0095bffa852b Mon Sep 17 00:00:00 2001
From: Andrey Sobolev <haiodo@gmail.com>
Date: Thu, 2 Dec 2021 20:02:18 +0700
Subject: [PATCH] Fix Hierarchy is extends is not working second time

Fix Hierarchy is extends is not working second time

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>
---
 packages/core/src/hierarchy.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/hierarchy.ts b/packages/core/src/hierarchy.ts
index 7820cf218a..d5d2e9e56e 100644
--- a/packages/core/src/hierarchy.ts
+++ b/packages/core/src/hierarchy.ts
@@ -165,7 +165,7 @@ export class Hierarchy {
    */
   private isExtends<T extends Doc>(extendsOrImplements: Ref<Interface<Doc>>[], from: Ref<Interface<T>>): boolean {
     const result: Ref<Interface<Doc>>[] = []
-    const toVisit = extendsOrImplements
+    const toVisit = [...extendsOrImplements]
     while (toVisit.length > 0) {
       const ref = toVisit.shift() as Ref<Interface<Doc>>
       if (ref === from) {