nixpkgs/pkgs/development/libraries/haskell/pattern-arrows/default.nix

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{ cabal, mtl }:
cabal.mkDerivation (self: {
pname = "pattern-arrows";
version = "0.0.2";
sha256 = "13q7bj19hd60rnjfc05wxlyck8llxy11z3mns8kxg197wxrdkhkg";
buildDepends = [ mtl ];
meta = {
homepage = "http://blog.functorial.com/posts/2013-10-27-Pretty-Printing-Arrows.html";
description = "Arrows for Pretty Printing";
license = self.stdenv.lib.licenses.mit;
platforms = self.ghc.meta.platforms;
};
})