fix

Author: tyralla

mypy/binder.py

@@ -6,6 +6,7 @@
 from typing_extensions import TypeAlias as _TypeAlias
 
 from mypy.erasetype import remove_instance_last_known_values
+from mypy.join import join_simple
 from mypy.literals import Key, literal, literal_hash, subkeys
 from mypy.nodes import Expression, IndexExpr, MemberExpr, NameExpr, RefExpr, TypeInfo, Var
 from mypy.subtypes import is_same_type, is_subtype