--- a/mercurial/cext/mpatch.c	Sun Feb 20 16:13:57 2022 -0700
+++ b/mercurial/cext/mpatch.c	Sun Feb 20 16:09:02 2022 -0700
@@ -144,8 +144,7 @@
 	Py_ssize_t patchlen;
 	char *bin;
 
-	if (!PyArg_ParseTuple(args, PY23("ls#", "ly#"), &orig, &bin,
-	                      &patchlen)) {
+	if (!PyArg_ParseTuple(args, "ly#", &orig, &bin, &patchlen)) {
 		return NULL;
 	}