Thanks Sterl, you're right, this was because I have don´t compiled with the
-threaded flag, this works fine now.
> This answer may be way off base, but if differences appear between
> ghci and compiled versions, I've often found its as simple as
> remembering to compile with the -threaded flag. The ghci runtime is
> threaded by default, as I understand it, while compiled binaries are
> not, and IO operations will block in very different fashions (i.e. in
> their own thread, or stalling the entire app) depending on the runtime.
> Regards,
> sterl.
Alvaro
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