Revamping associative arrays

[BCS]

Hello Moritz,

> On Sat, 17 Oct 2009 19:06:36 +0000, Moritz Warning wrote:
> 
>> On Sat, 17 Oct 2009 18:58:08 +0000, BCS wrote:
>> 
>>> what will this do?
>>> 
>>> foreach(key; aa.keys)
>>> if(Test(key))
>>> aa.remove(key);
>>
>> It's undefined behavior.
>> You shouldn't try to mutate the aa while iterating. I hope that will
>> be
>> fixed.
>> It took me some time to find this out.
>
> Uh, sorry.
> You are iterating over an fresh allocated array of the keys.
> That's ok.

As it happens, your comment would be correct if .keys were, as proposed, 
made to be a range that walks the AA.