[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

mypy/checkexpr.py

@@ -194,7 +194,6 @@
 from mypy.typevars import fill_typevars
 from mypy.util import split_module_names
 from mypy.visitor import ExpressionVisitor
-from checker import TypeChecker
 
 # Type of callback user for checking individual function arguments. See
 # check_args() below for details.

mypy/messages.py

@@ -16,7 +16,17 @@
 import re
 from contextlib import contextmanager
 from textwrap import dedent
-from typing import Any, Callable, Collection, Final, Iterable, Iterator, Protocol, List, Sequence, cast
+from typing import (
+    Any,
+    Callable,
+    Collection,
+    Final,
+    Iterable,
+    Iterator,
+    List,
+    Sequence,
+    cast,
+)
 
 import mypy.typeops
 from mypy import errorcodes as codes, message_registry
@@ -110,7 +120,7 @@
     "typing.TypeVar",
     "typing.Union",
     "typing.cast",
-    "typing.Protocol"
+    "typing.Protocol",
 }