nixpkgs/pkgs/development/tools/parsing/happy/happy-1.18.4.nix

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{cabal, mtl, perl}:
cabal.mkDerivation (self : {
pname = "happy";
version = "1.18.4"; # Haskell Platform 2009.2.0.1
name = self.fname;
sha256 = "909bec4541a92d3765e74756f752514d2d03ec7a5d3e74c18268a57fe7ffa832";
extraBuildInputs = [perl];
propagatedBuildInputs = [mtl];
meta = {
description = "Happy is a parser generator for Haskell";
};
})