Plesse see http://trac.sagemath.org/ticket/16715#comment:2.

On Friday, July 25, 2014 9:51:47 AM UTC-5, Volker Braun wrote:
>
> The nonbreaking space tend to creep in when copy-pasting from a web 
> browser. Feel free to open a ticket and remove them.
>
>
>
>
> On Friday, July 25, 2014 10:43:08 AM UTC-4, Steven Trogdon wrote:
>>
>> The following error is present in generating the html docs for 
>> sage-on-gentoo:
>>
>> OSError: [tutorial ] 
>> /storage/strogdon/gentoo-redlizard/var/tmp/portage/sci-mathematics/sage-doc-9999-r1/work/sage-9999/src/doc/fr/tutorial/tour_coercion.rst:149:
>>  
>> WARNING: Inline literal start-string without end-string.
>>
>> and
>>
>> $ rst2html.py src/doc/fr/tutorial/tour_coercion.rst > /dev/null
>> src/doc/fr/tutorial/tour_coercion.rst:149: (WARNING/2) Inline literal 
>> start-string without end-string
>>
>> We are using docutils-0.11. Everything seems OK with the docutils that's 
>> shipped with vanilla Sage. Line 149 of tour_coercion.rst begins with
>>
>> Le type ``RingElement`` ne correspond pas parfaitement à la notion
>> mathématique d'élément d'anneau. Par exemple, bien que les matrices 
>> carrées
>> appartiennent à un anneau, elles ne sont pas de type ``RingElement`` :
>>
>> The problem seems to be with the second RingElement. Between the `` and : 
>> there is a hidden character or perhaps composition of characters. An octal 
>> dump (od -c) of the file reveals the character(s)
>>
>> 0013400       `   `   R   i   n   g   E   l   e   m   e   n   t   `   `
>> 0013420 302 240   :  \n  \n   :   :  \n  \n                   s   a   g
>>
>> The 302 is octal for a "circumflex capital A" and 240 is for a 
>> "nonbreaking space". Apparently, docutils-0.11 doesn't like this. Are there 
>> any ideas of how these characters made their way into tour_coercion.rst? If 
>> Sage upgrades to docutils-0.11 I'm reasonably sure the error will be 
>> present.
>>
>>

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