Add example for duplicate-bases message documentation (#6083)

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com> Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>
pylint-dev · Apr 1, 2022 · 03a115e · 03a115e
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commit 03a115e
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diff --git a/doc/data/messages/d/duplicate-bases/bad.py b/doc/data/messages/d/duplicate-bases/bad.py
@@ -0,0 +1,6 @@
+class Animal:
+    pass
+
+
+class Cat(Animal, Animal):  # [duplicate-bases]
+    pass
diff --git a/doc/data/messages/d/duplicate-bases/good.py b/doc/data/messages/d/duplicate-bases/good.py
@@ -0,0 +1,10 @@
+class Animal:
+    pass
+
+
+class Bird(Animal):
+    pass
+
+
+class Cat(Animal):
+    pass
diff --git a/pylint/checkers/classes/class_checker.py b/pylint/checkers/classes/class_checker.py
@@ -613,7 +613,7 @@ def _has_same_layout_slots(slots, assigned_value):
     "E0241": (
         "Duplicate bases for class %r",
         "duplicate-bases",
-        "Used when a class has duplicate bases.",
+        "Duplicate use of base classes in derived classes raise TypeErrors.",
     ),
     "E0242": (
         "Value %r in slots conflicts with class variable",