Seems `\definedescription' do not work

[Vladimir Lomov <lomov.vl@gmail.com>]

Hello,

I borrow this example from wiki:
<example file="ex2.tex">
%\setupbodyfont[computer-modern-unicode,12pt]

\definedescription
  [Desc]
  [location=top,hang=20,
   headstyle={\bf\color[blue]},
   command=\hskip-1cm,margin=1cm]

\starttext
\startDesc{Tufte}
\input tufte
\stopDesc
\stoptext
</example>

but context can't compile it:
<terminal output>
mtx-context     | run 1: luatex --fmt="/usr/local/opt/context/tex/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/formats/cont-en" --lua="/usr/local/opt/context/tex/texmf-cache/luatex-cache/context/2448223e6631addb83df348d74153606/formats/cont-en.lui" --backend="pdf" "./ex2.tex" \stoptext
This is LuaTeX, Version beta-0.70.1-2011051918 (rev 4277) 
 \write18 enabled.
(ex2.tex

ConTeXt  ver: 2012.04.26 22:27 MKIV  fmt: 2012.4.28  int: english/english

system          > cont-new.mkiv loaded
(/usr/local/opt/context/tex/texmf-context/tex/context/base/cont-new.mkiv
system          > beware: some patches loaded from cont-new.mkiv
)
system          > ex2.top loaded
(ex2.top)
fonts           > latin modern fonts are not preloaded
languages       > language en is active
{/usr/local/opt/context/tex/texmf-context/fonts/map/pdftex/context/mkiv-base.map}
fonts           > preloading latin modern fonts (second stage)
fonts           > typescripts > unknown: library 'loc'
{/usr/local/opt/context/tex/texmf/fonts/map/dvips/lm/lm-math.map}{/usr/local/opt/context/tex/texmf/fonts/map/dvips/lm/lm-rm.map}
fonts           > virtual math > unable to resolve name mapsfromchar
fonts           > fallback modern rm 12pt is loaded
! Missing } inserted.

system          > tex > error on line 11 in file ex2.tex: Missing  ...

 1     %\setupbodyfont[computer-modern-unicode,12pt]
 2     
 3     \definedescription
 4       [Desc]
 5       [location=top,hang=20,
 6        headstyle={\bf\color[blue]},
 7        command=\hskip-1cm,margin=1cm]
 8     
 9     \starttext
10     \startDesc{Tufte}
11 >>  \input tufte
12     \stopDesc
13     \stoptext
14     

<inserted text> 
                }
<to be read again> 
                   \endgroup 
\currentconstructiontext ...ionhandler \endcsname 
                                                  \endstrut 
\144>construction ... \currentconstructionsample }
                                                  }\assignwidth {\constructi...
\dodogotopar ...andler \v!construction \endcsname 
                                                  \BeforePar \emptytoks 
<to be read again> 
                   \input 
l.11 \input
            tufte
? 
</terminal output>

Do I miss something?

---
WBR, Vladimir Lomov

-- 
The time was the 19th of May, 1780.  The place was Hartford, Connecticut.
The day has gone down in New England history as a terrible foretaste of
Judgement Day.  For at noon the skies turned from blue to grey and by
mid-afternoon had blackened over so densely that, in that religious age,
men fell on their knees and begged a final blessing before the end came.
The Connecticut House of Representatives was in session.  And, as some of
the men fell down and others clamored for an immediate adjournment, the
Speaker of the House, one Col. Davenport, came to his feet.  He silenced
them and said these words: "The day of judgment is either approaching or
it is not.  If it is not, there is no cause for adjournment.  If it is, I
choose to be found doing my duty.  I wish therefore that candles may be
brought."
		-- Alistair Cooke
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