Re: fix for bug 10994 breaks ido customizations in major way

[Juri Linkov]

>> Looks like a generally useful piece. May be subr.el?
>>
>> Also delete-consecutive-dups could be very handy.
>
> If people find it generally useful we can provide
> delete-consecutive-dups and let users combine copy-sequence and
> delete-consecutive-dups for non-destructive case.

Since you intended to make `delete-consecutive-dups' destructive,
wouldn't it be more efficient to use `setcdr' like in `delete-dups'?

Then it could be also used for a new possible value of the option
`history-delete-duplicates' to delete consecutive elements from the history.