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 Re: \tlp_put ... Morten Høgholm <[log in to unmask]> Fri, 12 Sep 2008 14:26:45 +0200 text/plain (56 lines) On Fri, 12 Sep 2008 12:57:04 +0200, Frank Mittelbach wrote: > some history, perhaps Morten can say more because I think he did some of > the updates ... Yes, I changed this part of the code. > very early definition: > > \def_long_new:Npn \tlp_put_right:Nn #1#2{\tlp_set:No #1{#1#2}} > > current documentation says > > % A word of warning is appropriate here: Token list pointers are > % implemented as macros and as such currently inherit some of the > % peculiarities of how \TeX\ handles "#"s in the argument of > % macros. In particular, the following actions are legal > % \begin{verbatim} > % \tlp_set:Nn \l_tmpa_tlp{##1} > % \tlp_put_right:Nn \l_tmpa_tlp{##2} > % \tlp_set:No \l_tmpb_tlp{\l_tmpa_tlp ##3} > % \end{verbatim} > % |x| type expansions where macros being expanded contain |#|s do not > % work and will not work until there is an |\expanded| primitive in > % the engine. If you want them to work you must double |#|s another > % level. > % > > > from which I infer that the > > \tlp_set:Nn \l_exp_tlp{#2} > > was actually added to raise the error when setting / adding to the tlp > and not > during some later expansion deep down. Yes, that was why. This was the only way I could find where I'd at least get uniform behavior from the functions doing the same kind of expansions. As I recall it, that was not the case in the earlier versions. I am pretty sure the example from the documentation would not work with the original definitions. > However, we could do better now I guess given that we assume for expl3 > that eTeX is the underlying engine nowadays Even with that, I at least could not get it to work better than that. In desparation I cried out for an \expanded primitive on this list in December last year. But if someone can fix it all nicely with current tools, then I am happy to fold it in. -- Morten