Add newsfragment for #997

Author: hynek

changelog.d/997.change.rst

@@ -0,0 +1,2 @@
+``attrs.has()`` is now a ``TypeGuard`` for ``AttrsInstance``.
+That means that type checkers know a class is an instance of an ``attrs`` class if you check it using ``attrs.has()`` (or ``attr.has()``) first.

tests/typing_example.py

@@ -418,7 +418,6 @@ def accessing_from_attrs() -> None:
     attrs.cmp_using
 
 
-def has_typeguard() -> None:
-    foo = object
-    if attrs.has(foo):
-        foo.__attrs_attrs__
+foo = object
+if attrs.has(foo) or attr.has(foo):
+    foo.__attrs_attrs__