Updated error string

Author: randolf-scholz

Lib/test/test_patma.py

@@ -3449,7 +3449,7 @@ def test_class_pattern_not_type(self):
     def test_class_or_union_not_specialform(self):
         from typing import Literal
         name = type(Literal).__name__
-        msg = rf"called match pattern must be a class or types.UnionType \(got {name}\)"
+        msg = rf"called match pattern must be a class or typing.Union of classes \(got {name}\)"
         w = None
         with self.assertRaisesRegex(TypeError, msg):
             match 1:
@@ -3461,7 +3461,7 @@ def test_legacy_union_type(self):
         from typing import Union
         IntOrStr = Union[int, str]
         name = type(IntOrStr).__name__
-        msg = rf"called match pattern must be a class or types.UnionType \(got {name}\)"
+        msg = rf"called match pattern must be a class or typing.Union of classes \(got {name}\)"
         w = None
         with self.assertRaisesRegex(TypeError, msg):
             match 1:

Python/ceval.c

@@ -745,7 +745,7 @@ _PyEval_MatchClass(PyThreadState *tstate, PyObject *subject, PyObject *type,
         return NULL;
     }
     if (!PyType_Check(type)) {
-        const char *e = "called match pattern must be a class or types.UnionType (got %s)";
+        const char *e = "called match pattern must be a class or typing.Union of classes (got %s)";
         _PyErr_Format(tstate, PyExc_TypeError, e, Py_TYPE(type)->tp_name);
         return NULL;
     }