Compare http://golang.org/src/pkg/crypto/x509/x509.go to https://www.gitorious.org/gnutls/gnutls/source/6aa26f78150cc...
Other imports/files can be seen at: http://hackage.haskell.org/package/x509-1.4.10/docs/src
Other imports/files can be seen at: http://hackage.haskell.org/package/x509-1.4.10/docs/src