Re #18521: fix not-quite-C syntax that works only because the PyXXX_Check are macros defined with () around them.
diff --git a/Modules/_testbuffer.c b/Modules/_testbuffer.c
index a4e1643..0c6ef16 100644
--- a/Modules/_testbuffer.c
+++ b/Modules/_testbuffer.c
@@ -1815,7 +1815,7 @@
         if (init_slice(base, key, 0) < 0)
             goto err_occurred;
     }
-    else if PyTuple_Check(key) {
+    else if (PyTuple_Check(key)) {
         /* multi-dimensional slice */
         PyObject *tuple = key;
         Py_ssize_t i, n;