From 7821a7945bc80cf5b79cc1afe548df5c49dba9c6 Mon Sep 17 00:00:00 2001
From: Alessio Stalla <alessiostalla@gmail.com>
Date: Tue, 10 Oct 2023 10:11:50 +0200
Subject: [PATCH] Support and test internal fields on Python up to 3.12

---
 .github/workflows/pythonapp.yml | 2 +-
 pylasu/model/model.py           | 9 +++++++--
 tests/fixtures.py               | 3 ++-
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index 6692b26..a7fc8a6 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        python: [ '3.7', '3.8', '3.9', '3.10', '3.11' ]
+        python: [ '3.7', '3.8', '3.9', '3.10', '3.11', '3.12' ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
diff --git a/pylasu/model/model.py b/pylasu/model/model.py
index d0452d6..65bd17d 100644
--- a/pylasu/model/model.py
+++ b/pylasu/model/model.py
@@ -25,12 +25,17 @@ class InternalField(Field):
 
 
 def internal_field(
-        *, default=MISSING, default_factory=MISSING, init=True, repr=True, hash=None, compare=True, metadata=None):
+        *, default=MISSING, default_factory=MISSING, init=True, repr=True, hash=None, compare=True, metadata=None,
+        kw_only=False):
     """Return an object to identify internal dataclass fields. The arguments are the same as dataclasses.field."""
 
     if default is not MISSING and default_factory is not MISSING:
         raise ValueError('cannot specify both default and default_factory')
-    return InternalField(default, default_factory, init, repr, hash, compare, metadata)
+    try:
+        # Python 3.10+
+        return InternalField(default, default_factory, init, repr, hash, compare, metadata, kw_only)
+    except:
+        return InternalField(default, default_factory, init, repr, hash, compare, metadata)
 
 
 class Origin(ABC):
diff --git a/tests/fixtures.py b/tests/fixtures.py
index 91f250c..79a0a8c 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -1,13 +1,14 @@
 from dataclasses import dataclass, field
 from typing import List
 
-from pylasu.model import Node, pos
+from pylasu.model import Node, pos, internal_field
 
 
 @dataclass
 class Box(Node):
     name: str = None
     contents: List[Node] = field(default_factory=list)
+    internal: str = internal_field(default="unused")
 
 
 @dataclass