GD0105: Attempted to export indexer property
============================================

====================================  ======================================
                                      Value
====================================  ======================================
**Rule ID**                           GD0105
**Category**                          Usage
**Fix is breaking or non-breaking**   Non-breaking
**Enabled by default**                Yes
====================================  ======================================

Cause
-----

An indexer is annotated with the ``[Export]`` attribute. Indexers can't be exported.

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

Godot doesn't allow exporting indexer properties.

.. code-block:: csharp

    private int[] _backingField;

    // Indexers can't be exported.
    [Export]
    public int this[int index]
    {
        get => _backingField[index];
        set => _backingField[index] = value;
    }

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

To fix a violation of this rule, remove the ``[Export]`` attribute.

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

Do not suppress a warning from this rule. Indexers can't be exported so
they will be ignored by Godot, resulting in runtime errors.