Forbid dynamic arrays in boolean evaluation contexts

[Steven Schveighoffer]

On Mon, 25 Mar 2013 11:04:58 -0400, bearophile <bearophileHUGS at lycos.com>  
wrote:

> Steven Schveighoffer:
>
>> I would favor just changing the behavior.
>
> If you just change the behavior, then I suggest to take in account  
> associative arrays too:
>
>
> void main() {
>      bool[int] aa;
>      assert(!aa);
>      aa = [1: true];
>      assert(aa);
>      aa.remove(1);
>      assert(aa);
>      assert(!aa.length);
> }

This can be done without compiler changes.  Just define opCast!bool for  
AssocArray (or whatever the template is, I can't remember).

I do agree this should be done too.

-Steve