From bc8734174a0cd6513e55627464038aed22b3c32c Mon Sep 17 00:00:00 2001
From: Christian Heimes <christian@cheimes.de>
Date: Sat, 8 Dec 2007 22:11:32 +0000
Subject: [PATCH] Fixed #1573: Improper use of the keyword-only syntax makes
 the parser crash >>> def f(*, **kw): ...   pass ... python: Python/ast.c:652:
 handle_keywordonly_args: Assertion 'kwonlyargs != ((void *)0)' failed.

---
 Misc/NEWS    | 20 ++++++++++++++++++++
 Python/ast.c |  4 ++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index b3905c6ac3..f5ab8689bd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -4,7 +4,27 @@ Python News
 
 (editors: check NEWS.help for information about editing NEWS using ReST.)
 
+What's New in Python 3.0a3?
+===========================
+
+*Release data: XX-XXX-2008*
+
+Core and Builtins
+-----------------
+
+- Issue #1573: Improper use of the keyword-only syntax makes the parser crash
+
+
+Extension Modules
+-----------------
+
+
+Library
+-------
+
+
 What's New in Python 3.0a2?
+===========================
 
 *Release date: 07-Dec-2007*
 
diff --git a/Python/ast.c b/Python/ast.c
index 6ad43dd798..0127281a4d 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -649,8 +649,8 @@ handle_keywordonly_args(struct compiling *c, const node *n, int start,
     arg_ty arg;
     int i = start;
     int j = 0; /* index for kwdefaults and kwonlyargs */
-    assert(kwonlyargs != NULL);
-    assert(kwdefaults != NULL);
+    assert((kwonlyargs != NULL && kwdefaults != NULL) ||
+           TYPE(CHILD(n, i)) == DOUBLESTAR);
     while (i < NCH(n)) {
         ch = CHILD(n, i);
         switch (TYPE(ch)) {
-- 
2.40.0