nixpkgs/pkgs/development/libraries/haskell/errors/default.nix

{ cabal, either, safe, transformers }:

cabal.mkDerivation (self: {
  pname = "errors";
  version = "1.4.2";
  sha256 = "1csry8bbz7r4gc7x3lf1ih10rvnig2i91nfij227p9744yndl2xw";
  buildDepends = [ either safe transformers ];
  meta = {
    description = "Simplified error-handling";
    license = self.stdenv.lib.licenses.bsd3;
    platforms = self.ghc.meta.platforms;
  };
})
Add haskell-either version 3.0.2 and haskell-errors version 1.3.1. 2012-12-10 10:24:10 +00:00			`{ cabal, either, safe, transformers }:`

			`cabal.mkDerivation (self: {`
			`pname = "errors";`
haskell-errors: update to version 1.4.2 2013-07-01 10:04:03 +01:00			`version = "1.4.2";`
			`sha256 = "1csry8bbz7r4gc7x3lf1ih10rvnig2i91nfij227p9744yndl2xw";`
Add haskell-either version 3.0.2 and haskell-errors version 1.3.1. 2012-12-10 10:24:10 +00:00			`buildDepends = [ either safe transformers ];`
			`meta = {`
			`description = "Simplified error-handling";`
			`license = self.stdenv.lib.licenses.bsd3;`
			`platforms = self.ghc.meta.platforms;`
			`};`
			`})`