GD0401: The class must derive from GodotObject or a derived class
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                                      Value
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**Rule ID**                           GD0401
**Category**                          Usage
**Fix is breaking or non-breaking**   Breaking - If changing the inheritance chain

                                      Non-breaking - If removing the ``[GlobalClass]`` attribute
**Enabled by default**                Yes
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Cause
-----

A type annotated with the ``[GlobalClass]`` attribute does not derive from
``GodotObject``.

Rule description
----------------

The ``[GlobalClass]`` has no effect for types that don't derive from ``GodotObject``.
Every :ref:`global class <doc_c_sharp_global_classes>` must ultimately derive from
``GodotObject`` so it can be marshalled.

.. code-block:: csharp

    // This type is not registered as a global class because it doesn't derive from GodotObject.
    [GlobalClass]
    class SomeType { }

    // This type is a global class because it derives from Godot.Node
    // which ultimately derives from GodotObject.
    [GlobalClass]
    class MyNode : Node { }

    // This type is a global class because it derives from Godot.Resource
    // which ultimately derives from GodotObject.
    [GlobalClass]
    class MyResource : Resource { }

How to fix violations
---------------------

To fix a violation of this rule, change the type to derive from ``GodotObject``
or remove the ``[GlobalClass]`` attribute.

When to suppress warnings
-------------------------

Do not suppress a warning from this rule. Adding the ``[GlobalClass]`` to a type
that doesn't derive from ``GodotObject`` is an easy mistake to make and this
warning helps users realize that it may result in unexpected errors.