[Haskell-beginners] Too lazy/Too strict

I'm trying to take an html page whose last pre tag contains a hexdump and write the hex out as an executable. Link to truncated html example: http://pastebin.com/ENMDrsAT Link to my code: http://pastebin.com/XY0wgM6r I've got a memory leak somewhere, likely due to laziness, and I would appreciate help in finding it; this is the first one i've encountered, so I'm a bit clueless. -- Alex R