# [tex-live] fwd: \delta in overfull \hboxes screws up xterm

David Kastrup dak at gnu.org
Wed Jul 14 18:54:12 CEST 2004

Olaf Weber <olaf at infovore.xs4all.nl> writes:

> David Kastrup writes:
>
> [...]
>
> > There is no such control sequence.  This is the output from an
> > overfull hbox message.  It contains only nameless characters.
> > Whether they were produced by \mathcode, \char, \delta, whatever is
> > not known anymore.
>
> IMO the inability to go back from the internal codes to something
> resembling the source that produced them is a bug in the design of
> TeX.  "Fixing" TeX would require a major rewrite.

What is the source that produced them?

If you have the following TeX file:

\input binhex.tex
\char"\hex{x}

What is the source of the z' if I have

\def\xxx#1{\yyy{#1}}
\def\yyy#1{#1}

\xxx{z}

Is it the source code calling \xxx?  Is it the source of \xxx?  That
of \yyy?

--
David Kastrup, Kriemhildstr. 15, 44793 Bochum



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