http://anonscm.debian.org/cgi-bin/darcsweb.cgi?r=pkg-haskell/haskell-crypto;a=filediff;h=20120213034652-b2814-0019a3f92e453e9be86166d6c1f1bc0dad6e4d12.gz;f=patches/class-constraints.diff svn path=/nixpkgs/trunk/; revision=32808