Juri Linkov <juri@linkov.net> writes:

>> Please find attached two patches that tweaks how M-x
>> (execute-extended-command) works:
>>
>> 1. Show obsolete commands, and give their new name as an annotation.
>
> I noticed that some commands have " (nil)" appended as annotations
> in M-x completions, e.g. 'M-x browse- TAB'.  Looks like " (nil)"
> is returned in read-extended-command--annotation:
>
>           (obsolete
>            (format " (%s)" (car obsolete)))

Is the following sufficient?