[3.13] gh-151955: Allow more ParamSpec bounds (#152122)

gh-151955: Allow more ParamSpec and TypeVarTuple bounds (#151956)

(cherry picked from commit 0fb82b4)

Author: JelleZijlstra

Lib/test/test_typing.py

@@ -10046,6 +10046,17 @@ def test_paramspec_in_nested_generics(self):
         self.assertEqual(G2[[int, str], float], list[C])
         self.assertEqual(G3[[int, str], float], list[C] | int)
 
+    def test_paramspec_bound(self):
+        P = ParamSpec('P', bound=[int, str])
+        self.assertEqual(P.__bound__, [int, str])
+        P2 = ParamSpec('P2', bound=(int, str))
+        self.assertEqual(P2.__bound__, (int, str))
+        obj = object()
+        P3 = ParamSpec('P3', bound=obj)
+        self.assertIs(P3.__bound__, obj)
+        P4 = ParamSpec('P4')
+        self.assertIs(P4.__bound__, None)
+
     def test_paramspec_gets_copied(self):
         # bpo-46581
         P = ParamSpec('P')

Misc/NEWS.d/next/Library/2026-06-22-18-01-00.gh-issue-151955.6u5iwm.rst

@@ -0,0 +1,2 @@
+Allow more types to be used in the ``bound`` argument to
+:class:`typing.ParamSpec`.

Objects/typevarobject.c

@@ -1061,20 +1061,12 @@ paramspec_new_impl(PyTypeObject *type, PyObject *name, PyObject *bound,
         PyErr_SetString(PyExc_ValueError, "Variance cannot be specified with infer_variance.");
         return NULL;
     }
-    if (bound != NULL) {
-        bound = type_check(bound, "Bound must be a type.");
-        if (bound == NULL) {
-            return NULL;
-        }
-    }
     PyObject *module = caller();
     if (module == NULL) {
-        Py_XDECREF(bound);
         return NULL;
     }
     PyObject *ps = (PyObject *)paramspec_alloc(
         name, bound, default_value, covariant, contravariant, infer_variance, module);
-    Py_XDECREF(bound);
     Py_DECREF(module);
     return ps;
 }