Patch #1531113: Fix augmented assignment with yield expressions.
Also fix a SystemError when trying to assign to yield expressions.
diff --git a/Lib/test/test_generators.py b/Lib/test/test_generators.py
index a184a8b..ee36413 100644
--- a/Lib/test/test_generators.py
+++ b/Lib/test/test_generators.py
@@ -1497,22 +1497,55 @@
<type 'generator'>
+A yield expression with augmented assignment.
+
+>>> def coroutine(seq):
+... count = 0
+... while count < 200:
+... count += yield
+... seq.append(count)
+>>> seq = []
+>>> c = coroutine(seq)
+>>> c.next()
+>>> print seq
+[]
+>>> c.send(10)
+>>> print seq
+[10]
+>>> c.send(10)
+>>> print seq
+[10, 20]
+>>> c.send(10)
+>>> print seq
+[10, 20, 30]
+
+
Check some syntax errors for yield expressions:
>>> f=lambda: (yield 1),(yield 2)
Traceback (most recent call last):
...
-SyntaxError: 'yield' outside function (<doctest test.test_generators.__test__.coroutine[10]>, line 1)
+SyntaxError: 'yield' outside function (<doctest test.test_generators.__test__.coroutine[21]>, line 1)
>>> def f(): return lambda x=(yield): 1
Traceback (most recent call last):
...
-SyntaxError: 'return' with argument inside generator (<doctest test.test_generators.__test__.coroutine[11]>, line 1)
+SyntaxError: 'return' with argument inside generator (<doctest test.test_generators.__test__.coroutine[22]>, line 1)
>>> def f(): x = yield = y
Traceback (most recent call last):
...
-SyntaxError: assignment to yield expression not possible (<doctest test.test_generators.__test__.coroutine[12]>, line 1)
+SyntaxError: assignment to yield expression not possible (<doctest test.test_generators.__test__.coroutine[23]>, line 1)
+
+>>> def f(): (yield bar) = y
+Traceback (most recent call last):
+ ...
+SyntaxError: can't assign to yield expression (<doctest test.test_generators.__test__.coroutine[24]>, line 1)
+
+>>> def f(): (yield bar) += y
+Traceback (most recent call last):
+ ...
+SyntaxError: augmented assignment to yield expression not possible (<doctest test.test_generators.__test__.coroutine[25]>, line 1)
Now check some throw() conditions: