Non-nullable property 'Hello' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'OnlyGet' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable event 'ShapeChanged' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable event 'ShapeChanged2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable event 'ShapeChangedNullable2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

The event 'DemoClass.ShapeChanged2' is never used

The event 'DemoClass.ShapeChanged' is never used

The event 'DemoClass.ShapeChangedNullable2' is never used

The event 'DemoClass.ShapeChangedNullable' is never used