foreach

[Demetri via Digitalmars-d]

On Thursday, 12 June 2014 at 15:56:17 UTC, simendsjo wrote:
> On 06/12/2014 05:46 PM, monarch_dodra wrote:
>> On Thursday, 12 June 2014 at 15:09:51 UTC, simendsjo wrote:
>>>
>>> _ is an often used identifier for "i don't care" in many 
>>> languages. The
>>> following works:
>>>   foreach(_; 0..n)
>> 
>> One issue is that "_" is still an actual identifier, with 
>> normal name
>> collision rules. So that works only once. When you nest your 
>> loops,
>> you'll end up having conflicts, and name your "i don't care 
>> variable"
>> things such as "_", "__", "___", "_1", "_2" etc...
>> 
>> It actually happens quite often I find.
>> 
>
> Yeah, not good. Does any sane person use _ as a variable 
> identifier and
> then reference it? A breaking change would be a special rule so 
> _ can
> never be used and is allowed to shadow. Of course - this could 
> break
> existing code, so it will never happen :)
An identifier could be chosen that started with two underscores. 
Those are already reserved.