pythongh-112205: Support docstring for @getter (python#113160)

---------

Co-authored-by: Erlend E. Aasland <erlend@python.org>

Lib/test/clinic.test.c

@@ -4956,11 +4956,16 @@ Test_meth_coexist_impl(TestObj *self)
 Test.property
 [clinic start generated code]*/
 
+#if defined(Test_property_HAS_DOCSTR)
+#  define Test_property_DOCSTR Test_property__doc__
+#else
+#  define Test_property_DOCSTR NULL
+#endif
 #if defined(TEST_PROPERTY_GETSETDEF)
 #  undef TEST_PROPERTY_GETSETDEF
-#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, (setter)Test_property_set, NULL},
+#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, (setter)Test_property_set, Test_property_DOCSTR},
 #else
-#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, NULL, NULL},
+#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, NULL, Test_property_DOCSTR},
 #endif
 
 static PyObject *
@@ -4974,16 +4979,21 @@ Test_property_get(TestObj *self, void *Py_UNUSED(context))
 
 static PyObject *
 Test_property_get_impl(TestObj *self)
-/*[clinic end generated code: output=af8140b692e0e2f1 input=2d92b3449fbc7d2b]*/
+/*[clinic end generated code: output=27b519719d992e03 input=2d92b3449fbc7d2b]*/
 
 /*[clinic input]
 @setter
 Test.property
 [clinic start generated code]*/
 
+#if defined(TEST_PROPERTY_HAS_DOCSTR)
+#  define Test_property_DOCSTR Test_property__doc__
+#else
+#  define Test_property_DOCSTR NULL
+#endif
 #if defined(TEST_PROPERTY_GETSETDEF)
 #  undef TEST_PROPERTY_GETSETDEF
-#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, (setter)Test_property_set, NULL},
+#  define TEST_PROPERTY_GETSETDEF {"property", (getter)Test_property_get, (setter)Test_property_set, Test_property_DOCSTR},
 #else
 #  define TEST_PROPERTY_GETSETDEF {"property", NULL, (setter)Test_property_set, NULL},
 #endif
@@ -4999,7 +5009,7 @@ Test_property_set(TestObj *self, PyObject *value, void *Py_UNUSED(context))
 
 static int
 Test_property_set_impl(TestObj *self, PyObject *value)
-/*[clinic end generated code: output=f3eba6487d7550e2 input=3bc3f46a23c83a88]*/
+/*[clinic end generated code: output=9797cd03c5204ddb input=3bc3f46a23c83a88]*/
 
 /*[clinic input]
 output push

Lib/test/test_clinic.py

@@ -2221,6 +2221,21 @@ class Foo "" ""
                 expected_error = f"{annotation} method cannot define parameters"
                 self.expect_failure(block, expected_error)
 
+    def test_setter_docstring(self):
+        block = """
+            module foo
+            class Foo "" ""
+            @setter
+            Foo.property
+
+            foo
+
+            bar
+            [clinic start generated code]*/
+        """
+        expected_error = "docstrings are only supported for @getter, not @setter"
+        self.expect_failure(block, expected_error)
+
     def test_duplicate_getset(self):
         annotations = ["@getter", "@setter"]
         for annotation in annotations: