Fix SF bug #1167751, Argument genexp corner case

Incorrect code was generated for:

  foo(a = i for i in range(10))

This should have generated a SyntaxError.  Fix the Grammar so
it raises a SyntaxError and test it.

I'm uncertain whether this should be backported.  It makes
something that was Syntactically valid invalid.  However,
the code would either be completely broken or do the wrong thing.

1 files changed, 14 insertions, 2 deletions

diff --git a/Lib/test/test_genexps.py b/Lib/test/test_genexps.py
index 894ce6a15a..7af3ac3435 100644
--- a/Lib/test/test_genexps.py
+++ b/Lib/test/test_genexps.py
@@ -82,6 +82,18 @@ Verify that parenthesis are required in a statement
        ...
     SyntaxError: invalid syntax
 
+Verify that parenthesis are required when used as a keyword argument value
+
+    >>> dict(a = i for i in xrange(10))
+    Traceback (most recent call last):
+       ...
+    SyntaxError: invalid syntax
+
+Verify that parenthesis are required when used as a keyword argument value
+
+    >>> dict(a = (i for i in xrange(10))) #doctest: +ELLIPSIS
+    {'a': <generator object at ...>}
+
 Verify early binding for the outermost for-expression
 
     >>> x=10
@@ -125,12 +137,12 @@ Verify that syntax error's are raised for genexps used as lvalues
     >>> (y for y in (1,2)) = 10
     Traceback (most recent call last):
        ...
-    SyntaxError: assignment to generator expression not possible (<doctest test.test_genexps.__test__.doctests[38]>, line 1)
+    SyntaxError: assignment to generator expression not possible (<doctest test.test_genexps.__test__.doctests[40]>, line 1)
 
     >>> (y for y in (1,2)) += 10
     Traceback (most recent call last):
        ...
-    SyntaxError: augmented assignment to generator expression not possible (<doctest test.test_genexps.__test__.doctests[39]>, line 1)
+    SyntaxError: augmented assignment to generator expression not possible (<doctest test.test_genexps.__test__.doctests[41]>, line 1)
 
 
 ########### Tests borrowed from or inspired by test_generators.py ############