[3.12] gh-111609: `end_offset` is ignored in subclasses of SyntaxError (#127554)

* `end_offset` is ignored in subclasses of SyntaxError

* 📜🤖 Added by blurb_it.

* Add test

---------

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

1 files changed, 28 insertions, 34 deletions

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 5f3d249..cf84573 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -538,43 +538,37 @@ parse_syntax_error(PyObject *err, PyObject **message, PyObject **filename,
         *offset = hold;
     }
 
-    if (Py_TYPE(err) == (PyTypeObject*)PyExc_SyntaxError) {
-        v = PyObject_GetAttr(err, &_Py_ID(end_lineno));
-        if (!v) {
-            PyErr_Clear();
-            *end_lineno = *lineno;
-        }
-        else if (v == Py_None) {
-            *end_lineno = *lineno;
-            Py_DECREF(v);
-        } else {
-            hold = PyLong_AsSsize_t(v);
-            Py_DECREF(v);
-            if (hold < 0 && PyErr_Occurred())
-                goto finally;
-            *end_lineno = hold;
-        }
-
-        v = PyObject_GetAttr(err, &_Py_ID(end_offset));
-        if (!v) {
-            PyErr_Clear();
-            *end_offset = -1;
-        }
-        else if (v == Py_None) {
-            *end_offset = -1;
-            Py_DECREF(v);
-        } else {
-            hold = PyLong_AsSsize_t(v);
-            Py_DECREF(v);
-            if (hold < 0 && PyErr_Occurred())
-                goto finally;
-            *end_offset = hold;
-        }
-    } else {
-        // SyntaxError subclasses
+    v = PyObject_GetAttr(err, &_Py_ID(end_lineno));
+    if (!v) {
+        PyErr_Clear();
         *end_lineno = *lineno;
+    }
+    else if (v == Py_None) {
+        *end_lineno = *lineno;
+        Py_DECREF(v);
+    } else {
+        hold = PyLong_AsSsize_t(v);
+        Py_DECREF(v);
+        if (hold < 0 && PyErr_Occurred())
+            goto finally;
+        *end_lineno = hold;
+    }
+
+    v = PyObject_GetAttr(err, &_Py_ID(end_offset));
+    if (!v) {
+        PyErr_Clear();
         *end_offset = -1;
     }
+    else if (v == Py_None) {
+        *end_offset = -1;
+        Py_DECREF(v);
+    } else {
+        hold = PyLong_AsSsize_t(v);
+        Py_DECREF(v);
+        if (hold < 0 && PyErr_Occurred())
+            goto finally;
+        *end_offset = hold;
+    }
 
     v = PyObject_GetAttr(err, &_Py_ID(text));
     if (!v)