how to skip the next (n) item & continue from (n+1) with a range ? e.g. in File(fn).byLine();

[mw]

On Monday, 22 June 2020 at 20:49:55 UTC, mw wrote:
> On Monday, 22 June 2020 at 20:46:30 UTC, mw wrote:
>> On Monday, 22 June 2020 at 20:00:50 UTC, Steven Schveighoffer 
>> wrote:
>>> I wouldn't recommend it, instead do a while loop:
>>>
>>> auto range = File(fn).byLine;
>>>
>>> while(!range.empty)
>>> {
>>>    auto line = range.front;
>>>    if(someCond(line)) {
>>>         range.popFrontN(n);
>
> I'm asking this, because here it need to be

either

> range.popFrontN(n+1);
>
> i.e. bug-prone

or

> can be fixed by:
>    auto line = range.front;
>    range.popFront;  // pop immediately

of course.