Index: Modules/_json.c
===================================================================
--- Modules/_json.c	(révision 71394)
+++ Modules/_json.c	(copie de travail)
@@ -1844,22 +1844,24 @@
 
     PyEncoderObject *s;
     PyObject *allow_nan;
+    int ok;
 
     assert(PyEncoder_Check(self));
     s = (PyEncoderObject *)self;
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOO:make_encoder", kwlist,
-        &s->markers, &s->defaultfn, &s->encoder, &s->indent, &s->key_separator, &s->item_separator, &s->sort_keys, &s->skipkeys, &allow_nan))
-        return -1;
+    ok = PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOO:make_encoder", kwlist,
+        &s->markers, &s->defaultfn, &s->encoder, &s->indent, &s->key_separator, &s->item_separator, &s->sort_keys, &s->skipkeys, &allow_nan);
 
-    Py_INCREF(s->markers);
-    Py_INCREF(s->defaultfn);
-    Py_INCREF(s->encoder);
-    Py_INCREF(s->indent);
-    Py_INCREF(s->key_separator);
-    Py_INCREF(s->item_separator);
-    Py_INCREF(s->sort_keys);
-    Py_INCREF(s->skipkeys);
+    Py_XINCREF(s->markers);
+    Py_XINCREF(s->defaultfn);
+    Py_XINCREF(s->encoder);
+    Py_XINCREF(s->indent);
+    Py_XINCREF(s->key_separator);
+    Py_XINCREF(s->item_separator);
+    Py_XINCREF(s->sort_keys);
+    Py_XINCREF(s->skipkeys);
+    if (!ok)
+        return -1;
     s->fast_encode = (PyCFunction_Check(s->encoder) && PyCFunction_GetFunction(s->encoder) == (PyCFunction)py_encode_basestring_ascii);
     s->allow_nan = PyObject_IsTrue(allow_nan);
     return 0;