From 122fb562d4f61a4862e05987f48d637b885bfeb6 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 1 Feb 2017 17:04:52 +0100
Subject: Document that _PyFunction_FastCallDict() must copy kwargs

Issue #29318: Caller and callee functions must not share the dictionary:
kwargs must be copied.
---
 Python/ceval.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Python/ceval.c b/Python/ceval.c
index 8738470..298ad55 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5039,6 +5039,8 @@ _PyFunction_FastCallDict(PyObject *func, PyObject **args, Py_ssize_t nargs,
     if (nk != 0) {
         Py_ssize_t pos, i;
 
+        /* Issue #29318: Caller and callee functions must not share the
+           dictionary: kwargs must be copied. */
         kwtuple = PyTuple_New(2 * nk);
         if (kwtuple == NULL) {
             return NULL;
-- 
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