internal override void IncRef(IntPtr o)
{
// Console.WriteLine("AST IncRef()");
if (Context == null)
throw new Z3Exception("inc() called on null context");
if (o == IntPtr.Zero)
throw new Z3Exception("inc() called on null AST");
Context.AST_DRQ.IncAndClear(Context, o);
base.IncRef(o);
}