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	["1496" "Mon" "22" "June" "1998" "20:53:58" "+0100" "Javier Bezos" "jbezos@MX3.REDESTB.ES" nil "40" "Re: l3 function names" "^Date:" nil nil "6" nil nil nil nil nil]
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Date:         Mon, 22 Jun 1998 20:53:58 +0100
From: Javier Bezos <jbezos@MX3.REDESTB.ES>
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Subject:      Re: l3 function names
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Hans Aberg (>) and myself (>>) wrote

>>Undescore in names
>>~~~~~~~~~~~~~~~~~~~
>>Changing the _ catcode prevents from using explicit subscript characters.
>>I think there are better candidates: "other" character except =, <, >,
>>. (sadly), , (ie, comma), - and +. (Namely /, !, ?, : (already used), ;,
>>@, |...)
>
>  This is something I worried about at first. But it is possible to build a
>new development level above the fundamental one where _ works as usual:
[snip]

Yet another level? No, please! ;-) Furtunately, the \lccode / \lowercase
trick
allows to introduce explicit subscripts in all of the known levels,
but it's a mess.

>>Argument specifiers
>>~~~~~~~~~~~~~~~~~~~~
>..
>>\let:NN{\arg1}{\arg2} is particularly amusing because the first N is
>>\arg1 and the second one is { with an unmatched brace.
>
>  One variation could be \<module name>_<command name>:<argument type>:,
>with a final ":" delimiting the argument type (\let:N: etc).
[snip]

That is not the problem. The first argument is an actual macro argument
which
it's read as usual, removing the braces if present. That expands to
\let\arg1= which in turn reads the very first token doesn't matter its
categorie, in this case {. This leaves \arg2} unused, where you can
see the unmatched brace. A bit tricky but clear when you are using TeX;
with \let:NN is not so clear what are you doing -- except when you learn
its TeX equivalence! (Admittedly this example is typical of a warped mind
:-) )

Regards
Javier Bezos