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Message-ID:  <2a679dcb-149c-079e-bb3e-cf37cacaf9b2@morningstar2.co.uk>
Date:         Thu, 20 Dec 2018 07:35:05 +0000
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              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
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From:         Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: Ambiguity in using some functions.
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Status: R

On 20/12/2018 05:56, Tisha Shusho wrote:
> Hello List,
> 
> In "The LaTeX3 Sources" document it says (on p. 296,
> Released 2018-12-12):
> "Older versions of expl3 divided up primitives by “source”:
> that becomes very tricky with multiple parallel engine
> developments, so has been dropped. To cover the transition,
> we provide the older names here for a limited period (until
> the end of019)."
> 
> Does this mean one should avoid using functions such as
> "\etex_iffontchar:D"?
> If yes, are there any alternative to such commands?
> 
> Furthermore, in "The expl3 package and LaTeX3 programming"
> document it says (on page 7, Released 2018-12-12):
> "D This means: Do not use. This special case is used for TEX
> primitives. Programmers outside the kernel team should not use
> these functions!"
> 
> Again, which function should a programmer who is not a member
> of kernel team use instead of "\etex_iffontchar:D"?
> 
> Thanks,
> Tisha

Hello,

We moved all of the primitives to \tex_...:D a while ago: the engine 
history is not really helpful in dealing with them.

For cases where you *have* to use a :D command, we recommend making a 
private copy

     \cs_neq_eq:NN \__module_fontchar:w \tex_fontchar:D

then using that.

Joseph