[luatex] \luaescapestring and \escapechar

Joseph Wright joseph.wright at morningstar2.co.uk
Fri May 16 22:41:49 CEST 2014

Hello all,

Running some tests today I stumbled across the following issue. With the


I get

    This is LuaTeX, Version beta-0.79.1 (TeX Live 2014) (rev 4971)
     restricted \write18 enabled.
    ! String contains an invalid utf-8 sequence.
    test ^^@-luaescapestring {noexpand foo }

    l.3 \test


I was as you'd imagined a bit surprised: I spent a while looking over my
source for dodgy input before concluding there is something more subtle up.

Is this in some way deliberate or a bug?
Joseph Wright

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