Hi all, 

The following example with the chemical module complains that "! Argument of
\mtharrowfill has an extra }.".

-----------
\usemodule[chemic]
\starttext
$$ \chemical{2H_2,PLUS,O_2,GIVES,2H_2O} $$
\stoptext
-----------

The result pdf looks fine, though. The annoying problem only occurs when
there's an arrow "GIVES", and only in display mode.

I am using ConTeXt 2007.08.24, and the complete warning message is

-----------
! Argument of \mtharrowfill has an extra }.
<inserted text> 
                \par
<to be read again> 
                   }
\chemicaloutermolecule ...chemicalstyle {\strut #1
                                                  }$}\doresetsubscripts
}\ma...

\dochemicalouterarrow ...>\!!zeropoint \box 4\fi }
                                                  \egroup
\p!compareprocessactionD ...ommalistelement {#3}#2
                                                  \expandafter
\quitcommalis...

\next2 #1,->\p!dodoprocessaction {#1}
                                     \doprocesscommaitem
...
-----------


Thanks a lot,
shenchen

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