From cc56d32799cc83c1172f29c007f3ec07be230ffc Mon Sep 17 00:00:00 2001
From: Mark Shannon <mark@hotpy.org>
Date: Mon, 1 Apr 2019 17:58:49 +0100
Subject: [PATCH 1/2] bpo-37207: enable vectorcall for type.__call__

---
 Objects/typeobject.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 3b9a537936a332..b828f79382f4dc 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -3614,7 +3614,7 @@ PyTypeObject PyType_Type = {
     sizeof(PyHeapTypeObject),                   /* tp_basicsize */
     sizeof(PyMemberDef),                        /* tp_itemsize */
     (destructor)type_dealloc,                   /* tp_dealloc */
-    0,                                          /* tp_vectorcall_offset */
+    offsetof(PyTypeObject, tp_vectorcall),      /* tp_vectorcall_offset */
     0,                                          /* tp_getattr */
     0,                                          /* tp_setattr */
     0,                                          /* tp_as_async */
@@ -3629,7 +3629,8 @@ PyTypeObject PyType_Type = {
     (setattrofunc)type_setattro,                /* tp_setattro */
     0,                                          /* tp_as_buffer */
     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-        Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TYPE_SUBCLASS,         /* tp_flags */
+    Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TYPE_SUBCLASS |
+    _Py_TPFLAGS_HAVE_VECTORCALL,                /* tp_flags */
     type_doc,                                   /* tp_doc */
     (traverseproc)type_traverse,                /* tp_traverse */
     (inquiry)type_clear,                        /* tp_clear */

From fead5afb7dcd825cc8d7bfb57c4d45df75235a72 Mon Sep 17 00:00:00 2001
From: Jeroen Demeyer <J.Demeyer@UGent.be>
Date: Sun, 7 Jul 2019 10:37:13 +0200
Subject: [PATCH 2/2] bpo-37207: add NEWS

---
 .../NEWS.d/next/C API/2019-07-07-10-37-07.bpo-37207.SlVNky.rst | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/C API/2019-07-07-10-37-07.bpo-37207.SlVNky.rst

diff --git a/Misc/NEWS.d/next/C API/2019-07-07-10-37-07.bpo-37207.SlVNky.rst b/Misc/NEWS.d/next/C API/2019-07-07-10-37-07.bpo-37207.SlVNky.rst
new file mode 100644
index 00000000000000..8df76614a0d733
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2019-07-07-10-37-07.bpo-37207.SlVNky.rst	
@@ -0,0 +1,3 @@
+The vectorcall protocol is now enabled for ``type`` objects: set
+``tp_vectorcall`` to a vectorcall function to be used instead of ``tp_new``
+and ``tp_init`` when calling the class itself.