[luatex] assertion error

[Ulrike Fischer]

With this latex document

\documentclass{article}
\pdfextension mapline{=cmr10 DejaVuSans "T1Encoding ReEncodeFont"
<[tex256.enc <DejaVuSans.ttf}
\begin{document}
blub
\end{document}

I get on windows 7 with luatex (from tl 2016 pretest) 
an error from the 

"Microsoft Visual C++ Runtime library"

The error message says:

Assertion failed!
Program: D:\texlive\2016\bin\win32\luatex.exe
File: utils/avl.c
Line: 744

Expression tree !=NULL

With luatex from TL 2015 (and \pdfmapline) there is no problem. 

I don't really want to use a font like this. I ran into the error
while comparing the output of some fonts. The real error came from
arial.ttf, I replaced it by dejavusans as this is part of texlive.


-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/