Haskell lazy I/O and closing files

Question

I\'ve written a small Haskell program to print the MD5 checksums of all files in the current directory (searched recursively). Basically a Haskell version of md5deep

Answer 1

EDIT: sorry, thought the problem was with the files, not diectory reading/traversal. Ignore this.

No problem, just explicitly open the file (openFile), read the contents (Data.ByteString.Lazy.hGetContents), perform the md5 hash (let !h = md5 contents), and explicitly close the file (hClose).