[metapost] drawdblarrow and if b0rked?

[Giuseppe Bilotta]

Hello,

I'm attaching to this email a file that used to compile with
metapost. I'm not sure at what upgrade it got borked because
I haven't been compiling it in a while but now the

  drawdblarrow subpath (.11, .90) of ((cinf+i*h, markbase) -- (cinf+(i+1)*h, prevmarkbase)) if i = 2: withcolor red elseif i=parts-2: withcolor blue fi;

line causes metapost to choke on withcolor.red.elseif,
complaining about the extra elseif.

Suggestions?

-- 
Giuseppe "Oblomov" Bilotta
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