GD0107: Types not derived from Node should not export Node members
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                                      Value
====================================  ======================================
**Rule ID**                           GD0107
**Category**                          Usage
**Fix is breaking or non-breaking**   Breaking
**Enabled by default**                Yes
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Cause
-----

A type that doesn't derive from ``Node`` contains an exported field or property
of a type that derives from ``Node``.

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

Exported nodes are serialized as ``NodePath``. Only types derived from ``Node``
are able to get the node instance from the ``NodePath``.

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

To fix a violation of this rule, avoid exporting ``Node`` members on a type that
doesn't derive from ``Node``, or consider exporting a ``NodePath``.

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

Do not suppress a warning from this rule. Types that don't derive from ``Node``
will be unable to retrieve the right node instance for exported ``Node`` members,
resulting in unexpected runtime errors.