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Subject: Funny error
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All,

This from the Metafun manual:

\setupoutput[pdf]

\runMPgraphicstrue

\setupcolors[state=start]

\startuseMPgraphic{FunnyFrame}
 picture p; numeric w, h, o;
 p:=textext.rt(\MPstring{FunnyFrame});
 w:=OverlayWidth; h:=OverlayHeight; o:=BodyFontSize;
 p:=p shifted (2o,h-ypart center p); draw p;
 drawoptions (withpen pencircle scaled 1pt withcolor .625red);
 draw (2o,h)--(0,h)--(0,0)--(w,0)--(w,h)--(xpart urcorner p, h) ;
 draw boundingbox p;
 setbounds currentpicture to unitsquare xyscaled (w,h);
\stopuseMPgraphic

\defineoverlay[FunnyFrame][\useMPgraphic{FunnyFrame}]

\defineframedtext[FunnyText][frame=off,background=FunnyFrame]

\def\StartFrame{\startFunnyText}
\def\StopFrame{\stopFunnyText}

\def\FrameTitle#1%
 {\setMPtext{FunnyFrame}{\hbox spread 1em {\hss\strut#1\hss}}}

\setMPtext{FunnyFrame}{}

\starttext

\FrameTitle{Zapf (1)}
\StartFrame
Coming back to the use of typefaces in electronic
publishing: many of the new typographers receive their
knowledge and information about the rules of typography from
books, from computer magazines or the instruction manuals
which they get with the purchase of a PC or software.
\StopFrame

\stoptext

Is producing this "funny" error:

>> unknown picture p
>> textext.rt
! Equation cannot be performed (unknown picture=numeric).
<to be read again>
                   (
l.211 p:=textext.rt(
                    "\hbox spread 1em {\hss \strut Zapf (1)\hss }");
?

Any ideas?