Hello,
When an \errmessage is issued with \errhelp set to be non-empty,
LuaTeX shows the message "Type <return> to proceed [etc]" immediately
after the \errhelp. Other engines suppress this message in the
presence of \errhelp. I don't know if the difference is voluntary.
In any case, it would seem better to add a newline between the
\errhelp text and the built-in "Type..." text.
On a Unix machine with TeXlive installed,
echo "H" | luatex '\errhelp{ABC}\errmessage{BOOM}'
prints the following to the terminal (a similar result is obtained if
the TeX code is put in a file)
This is LuaTeX, Version beta-0.70.2-2012062812 (TeX Live 2012)
restricted \write18 enabled.
! foo.
<*> \errhelp{ABC}\errmessage{foo}
? ABCType <return> to proceed, S to scroll future error messages,
R to run without stopping, Q to run quietly,
I to insert something,
1 or ... or 9 to ignore the next 1 to 9 tokens of input,
H for help, X to quit.
?
! Emergency stop.
<*> \errhelp{ABC}\errmessage{foo}
! ==> Fatal error occurred, no output PDF file produced!
Transcript written on texput.log.
I would like to know whether this lack of newline is a bug or not, to
know if I should add LuaTeX-specific code to the l3msg LaTeX3 package.
Regards,
Bruno
