[3.11] Re-enable commented-out test in test_generators.py (GH-104130) (#104261)

Re-enable commented-out test in test_generators.py (GH-104130)
(cherry picked from commit 4729383)

Co-authored-by: ymki4360 <[email protected]>

Author: miss-islington

Lib/test/test_generators.py

@@ -2097,11 +2097,10 @@ def printsolution(self, x):
   ...
 SyntaxError: 'yield' outside function
 
-# Pegen does not produce this error message yet
-# >>> def f(): x = yield = y
-# Traceback (most recent call last):
-#   ...
-# SyntaxError: assignment to yield expression not possible
+>>> def f(): x = yield = y
+Traceback (most recent call last):
+  ...
+SyntaxError: assignment to yield expression not possible
 
 >>> def f(): (yield bar) = y
 Traceback (most recent call last):