Move `@overload` to compat

.pre-commit-config.yaml

@@ -26,7 +26,7 @@ repos:
     hooks:
     -   id: flake8
         language_version: python3
-        additional_dependencies: [flake8-typing-imports]
+        additional_dependencies: [flake8-typing-imports==1.3.0]
 -   repo: https://github.com/asottile/reorder_python_imports
     rev: v1.4.0
     hooks:

src/_pytest/compat.py

@@ -9,6 +9,7 @@ import sys
 from contextlib import contextmanager
 from inspect import Parameter
 from inspect import signature
+from typing import overload
 
 import attr
 import py
@@ -347,3 +348,9 @@ class FuncargnamesCompatAttr:
 
         warnings.warn(FUNCARGNAMES, stacklevel=2)
         return self.fixturenames
+
+
+if sys.version_info < (3, 5, 2):
+
+    def overload(f):  # noqa: F811
+        return f

src/_pytest/python_api.py

@@ -1,7 +1,6 @@
 import inspect
 import math
 import pprint
-import sys
 from collections.abc import Iterable
 from collections.abc import Mapping
 from collections.abc import Sized
@@ -14,7 +13,6 @@ from typing import Callable
 from typing import cast
 from typing import Generic
 from typing import Optional
-from typing import overload
 from typing import Pattern
 from typing import Tuple
 from typing import TypeVar
@@ -23,17 +21,13 @@ from typing import Union
 from more_itertools.more import always_iterable
 
 import _pytest._code
+from _pytest.compat import overload
 from _pytest.compat import STRING_TYPES
 from _pytest.outcomes import fail
 
 if False:  # TYPE_CHECKING
     from typing import Type  # noqa: F401 (used in type string)
 
-if sys.version_info <= (3, 5, 1):
-
-    def overload(f):  # noqa: F811
-        return f
-
 
 BASE_TYPE = (type, STRING_TYPES)
 

src/_pytest/recwarn.py

@@ -1,6 +1,5 @@
 """ recording warnings during test function execution. """
 import re
-import sys
 import warnings
 from types import TracebackType
 from typing import Any
@@ -8,22 +7,17 @@ from typing import Callable
 from typing import Iterator
 from typing import List
 from typing import Optional
-from typing import overload
 from typing import Pattern
 from typing import Tuple
 from typing import Union
 
+from _pytest.compat import overload
 from _pytest.fixtures import yield_fixture
 from _pytest.outcomes import fail
 
 if False:  # TYPE_CHECKING
     from typing import Type
 
-if sys.version_info <= (3, 5, 1):
-
-    def overload(f):  # noqa: F811
-        return f
-
 
 @yield_fixture
 def recwarn():