[3.12] gh-106780: Add __match_args__ to tutorial example (GH-106784) (#106819)

Add Point definition with this attribute before example
that needs it.
(cherry picked from commit 7aa89e505d893cd5e6f33b84d66e5fa769089931)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 4336bf50df40a73871217f3cb2d6c7409fc2d0cc..e140f51f1dda7815189bb5fc52d5fb11c0402a02 100644 (file)
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -343,7 +343,13 @@ Dotted names (like ``foo.bar``), attribute names (the ``x=`` and ``y=`` above) o
 (recognized by the "(...)" next to them like ``Point`` above) are never assigned to.
 
 Patterns can be arbitrarily nested.  For example, if we have a short
-list of points, we could match it like this::
+list of Points, with ``__match_args__`` added, we could match it like this::
+
+    class Point:
+        __match_args__ = ('x', 'y')
+        def __init__(self, x, y):
+            self.x = x
+            self.y = y
 
     match points:
         case []: