From 6f09e44e5926ed3e041e96d9fb0b9b7eb66f2c4c Mon Sep 17 00:00:00 2001
From: Jukka Lehtosalo <jukka.lehtosalo@iki.fi>
Date: Sat, 6 Nov 2021 14:49:34 +0000
Subject: [PATCH] Minor optimization/cleanup

if TYPE_CHECKING is compiled inefficiently right now.
---
 mypy/types.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mypy/types.py b/mypy/types.py
index e8651d6eba79c..354129d909f92 100644
--- a/mypy/types.py
+++ b/mypy/types.py
@@ -956,9 +956,7 @@ class FunctionLike(ProperType):
     def __init__(self, line: int = -1, column: int = -1) -> None:
         super().__init__(line, column)
         self.can_be_false = False
-        if TYPE_CHECKING:  # we don't want a runtime None value
-            # Corresponding instance type (e.g. builtins.type)
-            self.fallback = cast(Instance, None)
+        self.fallback: Instance
 
     @abstractmethod
     def is_type_obj(self) -> bool: pass