redefined-slots-in-subclass crash when slot type is neither a str…

…ing or constant node (#6112)

* Suppress `invalid-slots-object` in the function tests for `redefined-slots-in-subclass`

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

ChangeLog

@@ -24,6 +24,10 @@ Release date: TBA
   * functions & classes which contain both a docstring and an ellipsis.
   * A body which contains an ellipsis ``nodes.Expr`` node & at least one other statement.
 
+* Fix crash for ``redefined-slots-in-subclass`` when the type of the slot is not a const or a string.
+
+  Closes #6100
+
 * Only raise ``not-callable`` when all the inferred values of a property are not callable.
 
   Closes #5931

pylint/checkers/classes/class_checker.py

@@ -1381,8 +1381,9 @@ def _check_redefined_slots(
                 slots_names.append(slot.value)
             else:
                 inferred_slot = safe_infer(slot)
-                if inferred_slot:
-                    slots_names.append(inferred_slot.value)
+                inferred_slot_value = getattr(inferred_slot, "value", None)
+                if isinstance(inferred_slot_value, str):
+                    slots_names.append(inferred_slot_value)
 
         # Slots of all parent classes
         ancestors_slots_names = {

tests/functional/r/redefined/redefined_slots.py

@@ -1,6 +1,6 @@
 """Checks that a subclass does not redefine a slot which has been defined in a parent class."""
 
-# pylint: disable=too-few-public-methods
+# pylint: disable=too-few-public-methods, invalid-slots-object
 
 from collections import deque
 
@@ -31,3 +31,9 @@ class Subclass3(Base, Base2):
        Redefining the `i`, `j`, `k` slot already defined in `Base2`
     """
     __slots__ = ("a", "b", "c", "i", "j", "k", "l", "m", "n")  # [redefined-slots-in-subclass]
+
+
+# https://github.com/PyCQA/pylint/issues/6100
+class MyClass:
+    """No crash when the type of the slot is not a Const or a str"""
+    __slots__ = [str]