Description:
Unity crashes when trying to show gizmos (only if using the [DrawGizmo] attribute in a static method inside a generic class with a generic field).

To reproduce:

1. Open test scene and attach "Example" script to "GameObject" game object.

Note: Unity crashes.

2. Remove line "X someField;" in "GizmoDrawer" script which is found in the "Editor" folder.
3. Open test scene and attach "Example" script to "GameObject" gameobject.

Note: Unity doesn't crash.

Reproduces with: 5.2.5f1; 5.3.6f1; 5.4.3f1; 5.5.0p3; 5.6.0b3;

Note: Also happens when "Example" script is attached to "GameObject" game object and then the line "X someField;" is written in "GizmoDrawer" script.