Re: Math styles

[Gavin Smith]

I attach your input file as sample.texi.

I thought I might have trouble running LuaTeX so first I tried it by
deleting the lines from the file which used LuaTeX.  I've attached this
as sample-fixed.texi.  Running TeX on this file went okay, apart from
a few error messages:

l.64: Unicode char @u8:  not defined for Texinfo
l.64: Unicode char @u8:  not defined for Texinfo

and so on.  I didn't check them all, but I think these were for 
characters in special typefaces like mathematical bold italic.  The 
output looked OK apart from the missing math bold characters (no literal 
@" in document and so on).  I tried this with the luatex command as well 
as with pdftex and it looked okay each time.  Is that the case for you?

I couldn't test the original file, presumably because my version of 
LuaTeX is out of date.  When I try running "luatex sample.texi", I get 
the following:

This is LuaTeX, Version beta-0.87.0 (TeX Live 2016/dev) 
(./sample.texi (./luaotfload.sty
! I can't find file `ltluatex'.
l.38   \input ltluatex
                    
(Press Enter to retry, or Control-D to exit)
Please type another input file name: 

Thus, there is probably no bug in Texinfo here, as it works when you
don't load extra TeX code from other packages (which has never been 
encouraged or guaranteed to work).  Obviously, if I can't reproduce
the faulty output file with my setup, I can't investigate any deeper
into what is happening here.

> It results in the error:
>   String contains an invalid utf-8 sequence
> There are some character translations causing this, it seems.

I'd have to see the input file to know for sure, but one thing to check 
is that your input is properly formed UTF-8.

sample.texi
Description: TeXInfo document

sample-fixed.texi
Description: TeXInfo document