Add to shared interface

Author: sterliakov

mypy/checker_shared.py

@@ -15,6 +15,7 @@
 from mypy.nodes import (
     ArgKind,
     Context,
+    Decorator,
     Expression,
     FuncItem,
     LambdaExpr,
@@ -279,6 +280,10 @@ def checking_await_set(self) -> Iterator[None]:
     def get_precise_awaitable_type(self, typ: Type, local_errors: ErrorWatcher) -> Type | None:
         raise NotImplementedError
 
+    @abstractmethod
+    def get_property_instance(self, method: Decorator) -> Instance | None:
+        raise NotImplementedError
+
 
 class CheckerScope:
     # We keep two stacks combined, to maintain the relative order