[Magick-bugs] strange interaction between '[0]' and -define pdf:use-cropbox=true

[duc.sequere.aut.de.via.decede at imagemagick.org]

> convert -define pdf:use-cropbox=true v.pdf'[0]' v.tif

This command works fine with the latest ImageMagick release, 6.4.4-8.  Not
sure why its fails under 6.3.5.