On Tue, Nov 15, 2011 at 03:30:55PM +0000, Joseph Wright wrote:
>On 15/11/2011 14:15, Alexander Grahn wrote:
>> Good afternoon,
>> 
>> I updated my TL-2011 packages today. Now, expl3 doesn't work anymore.
>> 
>>   \listfiles
>>   \documentclass{minimal}
>>   
>>   \usepackage{expl3}
>>   
>>   \begin{document}
>>   \ExplSyntaxOn
>>     \tl_new:Nn\g_example_tl{hello!}
>>     \g_example_tl
>>   \ExplSyntaxOff
>>   \end{document}
>> 
>> leads to:
>> 
>>   ! Undefined control sequence.
>>   l.8   \tl_new:Nn
>>                   \g_example_tl{hello!}
>>   ? q
>> 
>> What is going on?
>> 
>> Regards,
>> Alexander
>
>Hello Alexander,
>
>We've worked hard on sorting out a number of inconsistencies in expl3
>over the last few months. Some time ago now, we removed a number of
>functions which it had become clear did not quite 'fit'. One of those
>was \tl_new:Nn - use either \tl_new:N plus \tl_set:Nn for a variable or
>\tl_const:Nn for a constant.
>
>Functions for removal are now announced on the list both when we decide
>to remove them and when we actually do. A comprehensive list of
>functions removed since the 'big bang' work (which moved expl3 into
>'l3kernel') is available from
>
>https://github.com/latex3/svn-mirror/blob/master/l3kernel/l3obsolete.txt
>
>We anticipate that very few functions will be removed from the l3kernel
>in future, but there are still some places where this may happen. AS I
>said, we are aiming to announce /every/ removal on the list.
>-- 
>Joseph Wright
>

Thanks, Joseph, for the pointer to l3obsolete.txt.

I filtered out all occurences of \tl_new:Nn in my current project.
Another obsolete function I found is \tl_greplace_all_in:Nnn, but
\tl_greplace_all:Nnn does the same job, I guess.

Regards,
Alexander