Avoid adding the name of a parent namedtuple to child's locals

ChangeLog

@@ -12,6 +12,9 @@ What's New in astroid 2.11.2?
 =============================
 Release date: TBA
 
+* Avoided adding the name of a parent namedtuple to its child's locals.
+
+  Refs PyCQA/pylint#5982
 
 
 What's New in astroid 2.11.1?

astroid/brain/brain_namedtuple_enum.py

@@ -133,7 +133,11 @@ def infer_func_form(
     # we know it is a namedtuple anyway.
     name = name or "Uninferable"
     # we want to return a Class node instance with proper attributes set
-    class_node = nodes.ClassDef(name, parent=node.parent)
+    class_node = nodes.ClassDef(name)
+    # A typical ClassDef automatically adds its name to the parent scope,
+    # but doing so causes problems, so defer setting parent until after init
+    # see: https://github.com/PyCQA/pylint/issues/5982
+    class_node.parent = node.parent
     class_node.postinit(
         # set base class=tuple
         bases=[base_type],

tests/unittest_brain.py

@@ -159,6 +159,8 @@ class X(namedtuple("X", ["a", "b", "c"])):
         self.assertEqual(
             [anc.name for anc in klass.ancestors()], ["X", "tuple", "object"]
         )
+        # See: https://github.com/PyCQA/pylint/issues/5982
+        self.assertNotIn("X", klass.locals)
         for anc in klass.ancestors():
             self.assertFalse(anc.parent is None)