[luatex] assertion error

Ulrike Fischer luatex at nililand.de
Wed May 11 19:26:04 CEST 2016

With this latex document

\pdfextension mapline{=cmr10 DejaVuSans "T1Encoding ReEncodeFont"
<[tex256.enc <DejaVuSans.ttf}

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 

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