nixpkgs/pkgs/development/tools/parsing/happy/1.18.6.nix

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{cabal, mtl, perl}:
cabal.mkDerivation (self : {
pname = "happy";
version = "1.18.6"; # Haskell Platform 2011.2.0.0
name = self.fname;
sha256 = "0q6dnwihi1q761qdq0hhi733nh5d53xz6frwmr7slpvrp6v8y344";
extraBuildInputs = [perl];
propagatedBuildInputs = [mtl];
meta = {
description = "Happy is a parser generator for Haskell";
};
})