Deprecate is_typing_guard and is_sys_guard (#1202)

* Deprecate is_typing_guard and is_sys_guard

References #1199

Co-authored-by: Marc Mueller <[email protected]>

Author: Pierre-Sassoulas

ChangeLog

@@ -40,6 +40,11 @@ Release date: TBA
 
   Closes PyCQA/pylint#5059
 
+* The ``is_typing_guard`` and ``is_sys_guard`` functions are deprecated and will
+  be removed in 3.0.0. They are complex meta-inference functions that are better
+  suited for pylint. Import them from ``pylint.checkers.utils`` instead
+  (requires pylint ``2.12``).
+
 
 What's New in astroid 2.8.0?
 ============================

astroid/nodes/node_classes.py

@@ -39,6 +39,7 @@
 import itertools
 import sys
 import typing
+import warnings
 from functools import lru_cache
 from typing import TYPE_CHECKING, Callable, Generator, Optional
 
@@ -2870,6 +2871,10 @@ def is_sys_guard(self) -> bool:
         >>> node.is_sys_guard()
         True
         """
+        warnings.warn(
+            "The 'is_sys_guard' function is deprecated and will be removed in astroid 3.0.0",
+            DeprecationWarning,
+        )
         if isinstance(self.test, Compare):
             value = self.test.left
             if isinstance(value, Subscript):
@@ -2891,6 +2896,10 @@ def is_typing_guard(self) -> bool:
         >>> node.is_typing_guard()
         True
         """
+        warnings.warn(
+            "The 'is_typing_guard' function is deprecated and will be removed in astroid 3.0.0",
+            DeprecationWarning,
+        )
         return isinstance(
             self.test, (Name, Attribute)
         ) and self.test.as_string().endswith("TYPE_CHECKING")