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-rw-r--r--Python/ceval.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/Python/ceval.c b/Python/ceval.c
index 1c6089d..25fbc0f 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4118,6 +4118,13 @@ PyEval_CallObjectWithKeywords(PyObject *func, PyObject *arg, PyObject *kw)
{
PyObject *result;
+#ifdef Py_DEBUG
+ /* PyEval_CallObjectWithKeywords() must not be called with an exception
+ set. It raises a new exception if parameters are invalid or if
+ PyTuple_New() fails, and so the original exception is lost. */
+ assert(!PyErr_Occurred());
+#endif
+
if (arg == NULL) {
arg = PyTuple_New(0);
if (arg == NULL)