On Mon, 30 Jan 2017, Juri Linkov wrote:

>>>> +Optional arg REGION, if non-nil, mean restrict search to the
>>>> +specified region.  Otherwise search the entire buffer.
>>>> +When REGION is non-nil, it must be a cons (START . END).
>>>
>>> When someone decides to add support for rectangular regions in occur later,
>>> your current implementation will make this problematic since it changes
>>> the format ((START . END)) to (START . END), that makes difficult to support
>>> ((START1 . END1) (START2 . END2) ...) later.
>>>
>>> Let's stick to the same format in all uses of the new ‘REGION’ arg, and
>>> currently in occur support only the degenerate case of ((START . END))
>>> for non-rectangular regions.
>>
>> Thanks.  I was also a bit worry with that detail.
>> OK, i keep the general format ((START . END)).
>> Let me know if the following patch is OK to be pushed:
>
> Looks good to me, but you have to ask Eli for the permission to push.
OK, I will ask.
Thank you very much for your help implementing this.