Warn about do nothing expressions?

[Timon Gehr]

On 03/28/2014 07:04 PM, Frustrated wrote:
>
> I imagine what is going on is that D is creating a temp variable,
> assigning it to the local variable, then incrementing the temp
> variable(since++ increments "after" the assignment).

int tmp = i;
++i;
i = tmp;