.opAssign disabled without @disable

[denizzzka via Digitalmars-d-learn]

On Saturday, 16 April 2016 at 15:15:18 UTC, Alex Parrill wrote:

> Try removing the const from this line:
>
> debug private const bool isLeafNode = false;
>
> I suspect that D is disabling whole-structure assignment since 
> allowing it would mean that the constant `isLeafNode` could be 
> changed.

Tried - is no avail.