[NTG-context] [ errors imposition example ]

[NTG-context] [ errors imposition example ]

[vm via ntg-context]

while trying the "Getting the last page of a Booklet" example on the 
wiki page https://wiki.contextgarden.net/Imposition
context complains:

open source     > level 1, order 2, name './imposition_test2.tex'
! Control sequence expected instead of undefined.
<argument>
     \v!nextquadruple
<macro> \installpagebreakhandler
     #1#2->\defcsname \??pagebreakmethod #1
     \endcsname {#2}
<line 3.18>
        \fi}
You injected something that confused the parser, maybe by using some Lua 
call.




this is the example code:

8<---
\unprotect

\startvariables    all
     nextquadruple: nextquadruple
\stopvariables

\installpagebreakhandler \v!nextquadruple
   {\ifdoublesided
      \!!counta\realpageno
      \!!countb\realpageno
      \advance\!!counta 4
      \divide\!!counta 4
      \multiply\!!counta 4
      \advance\!!countb 1
      \advance\!!counta-\!!countb
      \executepagebreakhandler\v!yes
      \dorecurse\!!counta{\executepagebreakhandler\v!empty}%
    \fi}

\protect

\setuppapersize[A5][A4]
\setuparranging[2UP,rotated,doublesided]
\setuppagenumbering[alternative=doublesided]

\starttext

\subject{Front Cover}

\dorecurse{10}{\input tufte \par}

\page[nextquadruple]

Back Cover

\stoptext
--->8



most likely there is a reason for the error...


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