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Morten Høgholm wrote:

> On Fri, 28 Dec 2007 14:31:52 +0100, Andreas Matthias wrote:
>
>> Well, I am still pondering on this. How does \def:Npx fit into this
>> scheme? The x argument is not expanded before being passed to \edef.
>
> The x argument is expanded before being passed on the
> \def:Npn. Which is  more or less true except currently it is
> implemented as a straight \edef  because it would otherwise suffer
> from the same problems as other  functions needing to go through a
> temporary variable in the \::x function.  With the \expanded
> primitive in pdfTeX 1.50 we should have uniform  behavior at last.
>
>> Here are some other functions I just ran across, where the x might not
>> be appropriate: \io_put_deferred:Nx, \io_put_term:x, \io_put_log:x,
>> \err_message:x, \err_latex_bug:x. These names have the same problem
>> as the proposed \int_set:Nx, haven't they?
>
> Most of those functions are from before eTeX was required and so
> now one  could say the base form of many such messages was, say,
> \err_latex_bug:n  which just outputs a message (making it literal
> with \unexpanded) and then  there are x variants in case one wants
> to use the value of some variable  in the output. You are pointing
> to an area of the code which hasn't  received much attention after
> we started extending expl3 and it could use  some cleaning up (so
> could our 4-day old daughter so I better look at that  first! :-).

Sounds all reasonable to me. But these explanations can be used to
promote \int_set:Nx, as well. And here we start again ... ;-)

Ciao
Andreas