https://github.com/nucleic/kiwi/commit/f14059f532d6b5c6b505d9803b36a77b75546b18.patch
https://bugs.gentoo.org/849563

From f14059f532d6b5c6b505d9803b36a77b75546b18 Mon Sep 17 00:00:00 2001
From: Matthieu Dartiailh <m.dartiailh@gmail.com>
Date: Fri, 3 Jun 2022 09:11:18 +0200
Subject: [PATCH] py: use nullptr instead of 0 in PyTuple_SET_ITEM

--- a/py/src/symbolics.h
+++ b/py/src/symbolics.h
@@ -123,7 +123,7 @@ PyObject* BinaryMul::operator()( Expression* first, double second )
 		return 0;
 	Py_ssize_t end = PyTuple_GET_SIZE( first->terms );
 	for( Py_ssize_t i = 0; i < end; ++i )  // memset 0 for safe error return
-		PyTuple_SET_ITEM( terms.get(), i, 0 );
+		PyTuple_SET_ITEM( terms.get(), i, nullptr );
 	for( Py_ssize_t i = 0; i < end; ++i )
 	{
 		PyObject* item = PyTuple_GET_ITEM( first->terms, i );
--- a/py/src/util.h
+++ b/py/src/util.h
@@ -117,7 +117,7 @@ make_terms( const std::map<PyObject*, double>& coeffs )
         return 0;
     Py_ssize_t size = PyTuple_GET_SIZE( terms.get() );
     for( Py_ssize_t i = 0; i < size; ++i ) // zero tuple for safe early return
-        PyTuple_SET_ITEM( terms.get(), i, 0 );
+        PyTuple_SET_ITEM( terms.get(), i, nullptr );
     Py_ssize_t i = 0;
     iter_t it = coeffs.begin();
     iter_t end = coeffs.end();