https://github.com/breezy-team/patiencediff/commit/24e26cd2929e01dc8ef47fb71b3b87536ad43947

From 24e26cd2929e01dc8ef47fb71b3b87536ad43947 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Mon, 26 Sep 2022 21:49:47 +0100
Subject: [PATCH] Use designated initialiser syntax for PyTypeObject

Fixes build with Clang. Switch to the more readable designated
initialiser syntax to avoid having to lookup member order.

Before, Clang would complain:
```
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches -fPIC -I/usr/include/python3.10 -c patiencediff/_patiencediff_c.c -o build/temp.linux-x86_64-cpython-310/patiencediff/_patiencediff_c.o
patiencediff/_patiencediff_c.c:1175:5: error: incompatible pointer to integer conversion initializing 'Py_ssize_t' (aka 'long') with an expression of type 'void *' [-Wint-conversion]
    NULL, /* tp_print */
    ^~~~
/usr/include/wchar.h:46:14: note: expanded from macro 'NULL'
             ^~~~~~~~~~
```

This is because some of PyTypeObject's members are actually
Py_ssize_t so chucking a NULL in looks like a codesmell to Clang.

See https://docs.python.org/3/c-api/typeobj.html#quick-reference
and https://docs.python.org/3/c-api/typeobj.html#examples.

Bug: https://bugs.gentoo.org/869995
Closes: https://github.com/breezy-team/patiencediff/issues/12
Signed-off-by: Sam James <sam@gentoo.org>
--- a/patiencediff/_patiencediff_c.c
+++ b/patiencediff/_patiencediff_c.c
@@ -1168,44 +1168,13 @@ static char PatienceSequenceMatcher_doc[] =
 
 static PyTypeObject PatienceSequenceMatcherType = {
     PyVarObject_HEAD_INIT(NULL, 0)
-    "PatienceSequenceMatcher",  /* tp_name */
-    sizeof(PatienceSequenceMatcher), /* tp_basicsize */
-    0, /* tp_itemsize */
-    (destructor)PatienceSequenceMatcher_dealloc, /* tp_dealloc */
-    NULL, /* tp_print */
-    NULL, /* tp_getattr */
-    NULL, /* tp_setattr */
-    NULL, /* tp_compare */
-    NULL, /* tp_repr */
-    NULL, /* tp_as_number */
-    NULL, /* tp_as_sequence */
-    NULL, /* tp_as_mapping */
-    NULL, /* tp_hash */
-    NULL, /* tp_call */
-    NULL, /* tp_str */
-    NULL, /* tp_getattro */
-    NULL, /* tp_setattro */
-    NULL, /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT, /* tp_flags */
-    PatienceSequenceMatcher_doc, /* tp_doc */
-    NULL, /* tp_traverse */
-    NULL, /* tp_clear */
-    NULL, /* tp_richcompare */
-    0, /* tp_weaklistoffset */
-    NULL, /* tp_iter */
-    NULL, /* tp_iternext */
-    PatienceSequenceMatcher_methods, /* tp_methods */
-    NULL, /* tp_members */
-    NULL, /* tp_getset */
-    NULL, /* tp_base */
-    NULL, /* tp_dict */
-    NULL, /* tp_descr_get */
-    NULL, /* tp_descr_set */
-    0, /* tp_dictoffset */
-    NULL, /* tp_init */
-    NULL, /* tp_alloc */
-    PatienceSequenceMatcher_new, /* NULL */
-    NULL, /* tp_free */
+    .tp_name = "PatienceSequenceMatcher",
+    .tp_basicsize = sizeof(PatienceSequenceMatcher),
+    .tp_dealloc = (destructor)PatienceSequenceMatcher_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT,
+    .tp_doc = PatienceSequenceMatcher_doc,
+    .tp_methods = PatienceSequenceMatcher_methods,
+    .tp_new = PatienceSequenceMatcher_new,
 };