Metapost: point along path and metaobj

[Aditya Mahajan <adityam@umich.edu>]

Hi,

  Something goes wrong while using metaobj and point something along 
somepath. I do not know if point ... along... is a mp core command or 
something introduced by metafun. Is this metafun's fault, metaobj's 
fault or simply a metapost issue (and thus I should ask on the 
metapost list).

\setupcolors
   [state=start]

\startMPinclusions
   input metaobj;
\stopMPinclusions
% Everything works fine if I comment metaobj.


\starttext
\startMPpage
   path p ; p := (0,0)--(1cm,0) ;
   draw p
     withpen pencircle scaled 2bp
     withcolor 0.8white;

   draw (point .25 along p)--(point .75 along p)
     withpen pencircle scaled 2bp
     withcolor red ;
\stopMPpage
\stoptext

gives

! Missing argument to arctime.
<to be read again>
                    of
along->(arctime((EXPR0)*(arclength(EXPR1)))of
                                              (EXPR1))of(EXPR1)
<to be read again>
                    )
l.295 draw (point .25 along p)
                               --(point .75 along p)

Aditya