Move Sequence import out of TYPE_CHECKING condition

diff --git a/tornado/gen.py b/tornado/gen.py
index e818e10c3000ef822acdf90c4b12cdaab494ad8d..3dab733c6a9925214889f0b29862634d31a5cd02 100644 (file)
--- a/tornado/gen.py
+++ b/tornado/gen.py
@@ -101,11 +101,12 @@ from typing import (
     Tuple,
     Awaitable,
     Dict,
+    Sequence,
     overload,
 )
 
 if typing.TYPE_CHECKING:
-    from typing import Sequence, Deque, Optional, Set, Iterable  # noqa: F401
+    from typing import Deque, Optional, Set, Iterable  # noqa: F401
 
 _T = typing.TypeVar("_T")