Is removing elements of AA in foreach loop safe?

[XavierAP]

On Thursday, 29 August 2019 at 10:11:58 UTC, berni wrote:
> Iterating of some structure and removing elements thereby is 
> always errorprone and should be avoided. But: In case of AA, 
> I've got the feeling, that it might be safe:
>
>> foreach (k,v;ways)
>>     if (v.empty)
>>         ways.remove(k);
>
> Do you agree? Or is there a better way to achieve this?

It compiles and it runs without throwing any RangeError... So it 
appears to be safe. Otherwise it'd be a bug that there's not 
error.