With luatex, the following gives \starttext \startitemize[r] \item one \item two \stopitemize \stoptext ! LuaTeX error .../context/current/texmf/tex/context/base/core-con.lua:163: attempt to call field 'tolower' (a nil value). \romannumerals ...nvert.romannumerals(\number #1)} \actualitemnumber ...\currentitemnumber -1\relax } \fi \listitem ...alue {\@@localitemsymbol \itemlevel } \tempsymbol \getitemparame... \doattributes ...sname #1#2\@EA \endcsname \fi {#4 }\dostopattributes \dolistitem ...evel \c!style \c!color {\listitem } \fi \fi }\ifconditional \f... \complexdoitemgroupitem ...obreak \fi \dolistitem \relax \ifconditional \pac... ... l.5 \item o ne Aditya