On 14.12.2016 05:04, npostavs@users.sourceforge.net wrote:
> npostavs@users.sourceforge.net writes:
>>
>> I have tracked the issue down to scan_sexps_forward in syntax.c
> Applying this change which reverts part of [1] seems to fix the issue:
>
>
>
> Alan, can you explain what the idea behind that change was?
>
> I think it might correspond to this part of the commit message:
>
>      Reformulate code at the top of the main loop correctly to
>      recognize comment openers when starting in the middle of one.
>
> [1]: 9dcf5998935c Sun Mar 20 13:19:48 2016 +0000
> "Amend parse-partial-sexp correctly to handle two character comment delimiters"

Thanks a lot! BTW that message puzzles me too, AFAIK comments in C,C++ 
can't be nested.