From 8ea31c8f197c3f4c1fefdbf861530c831d250a59 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Noord?=
 <13665637+DanielNoord@users.noreply.github.com>
Date: Sun, 5 Dec 2021 13:03:21 +0100
Subject: Fix typing of Arguments.args (#1283)

---
 ChangeLog                     | 2 ++
 astroid/nodes/node_classes.py | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 7a5a34cd..7d701440 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -18,6 +18,8 @@ Release date: TBA
 
   Closes #1260
 
+* Fix typing and update explanation for ``Arguments.args`` being ``None``.
+
 
 What's New in astroid 2.9.0?
 ============================
diff --git a/astroid/nodes/node_classes.py b/astroid/nodes/node_classes.py
index 295f7d8c..ef6c52f4 100644
--- a/astroid/nodes/node_classes.py
+++ b/astroid/nodes/node_classes.py
@@ -858,8 +858,13 @@ class Arguments(mixins.AssignTypeMixin, NodeNG):
         self.kwarg: Optional[str] = kwarg  # can be None
         """The name of the variable length keyword arguments."""
 
-        self.args: typing.List[AssignName]
-        """The names of the required arguments."""
+        self.args: typing.Optional[typing.List[AssignName]]
+        """The names of the required arguments.
+
+        Can be None if the assosciated function does not have a retrievable
+        signature and the arguments are therefore unknown.
+        This happens with builtin functions implemented in C.
+        """
 
         self.defaults: typing.List[NodeNG]
         """The default values for arguments that can be passed positionally."""
-- 
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