From: da-woods <dw-git@d-woods.co.uk>
Date: Wed, 3 Jun 2026 13:20:35 +0000 (+0100)
Subject: Correct Stable ABI documentation for METH_FASTCALL (GH-149593)
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=58beae7319c58d850184d621d6635de23f71a229;p=thirdparty%2FPython%2Fcpython.git

Correct Stable ABI documentation for METH_FASTCALL (GH-149593)

* Correct Stable ABI documentation for METH_FASTCALL

The current documentation says:

>
> METH_FASTCALL
>    Part of the Stable ABI since version 3.7.
>
> [...]
>
>   Added in version 3.7.
>
>    Changed in version 3.10: METH_FASTCALL is now part of the stable ABI.

so is contradictory about when it was added to the Stable ABI.  Looking at the header it seems like 3.10 is right.
---

diff --git a/Doc/data/stable_abi.dat b/Doc/data/stable_abi.dat
index 2d4278c9d97c..86080fac7163 100644
--- a/Doc/data/stable_abi.dat
+++ b/Doc/data/stable_abi.dat
@@ -1,7 +1,7 @@
 role,name,added,ifdef_note,struct_abi_kind
 macro,METH_CLASS,3.2,,
 macro,METH_COEXIST,3.2,,
-macro,METH_FASTCALL,3.7,,
+macro,METH_FASTCALL,3.10,,
 macro,METH_METHOD,3.7,,
 macro,METH_NOARGS,3.2,,
 macro,METH_O,3.2,,
diff --git a/Misc/stable_abi.toml b/Misc/stable_abi.toml
index 8fd7aba09241..d59a7c788fa9 100644
--- a/Misc/stable_abi.toml
+++ b/Misc/stable_abi.toml
@@ -1813,7 +1813,6 @@
 [const.METH_COEXIST]
     added = '3.2'
 # METH_STACKLESS is undocumented
-# METH_FASTCALL is not part of limited API.
 
 # The following are defined in private headers, but historically
 # they were exported as part of the stable ABI.
@@ -2149,8 +2148,6 @@
 
 # New method flags in 3.7 (PEP 590):
 
-[const.METH_FASTCALL]
-    added = '3.7'
 [const.METH_METHOD]
     added = '3.7'
 
@@ -2300,6 +2297,10 @@
 [data.PyStructSequence_UnnamedField]
     added = '3.11'
 
+# Added in 3.7 but in the Stable ABI from 3.10
+[const.METH_FASTCALL]
+    added = '3.10'
+
 # Add stable Py_buffer API in Python 3.11 (https://bugs.python.org/issue45459)
 [struct.Py_buffer]
     added = '3.11'