[Haskell-cafe] broken IO support in uvector package, when using non primitive types

Hi. I'm sure this is a know bug, but I can't find details with Google. The offending code is here: http://hpaste.org/fastcgi/hpaste.fcgi/view?id=2362 When I execute the program I get: uio: readChunkBU: can't read What's the problem? I'm using uvector from: http://code.haskell.org/~dons/code/uvector/ Thanks Manlio Perillo