Fix spurious errors on builtins.open (python#15161)

hauntsaninja · web-flow · commit 66602fcde346 · 2023-05-02T14:51:13.000+01:00
Fixes python#14796
diff --git a/mypy/semanal_main.py b/mypy/semanal_main.py
@@ -75,6 +75,7 @@
     "abc",
     "collections",
     "collections.abc",
+    "typing_extensions",
 ]
 
 
