nixpkgs/pkgs/development/tools/parsing/happy/happy-1.18.5.nix

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{cabal, mtl, perl}:
cabal.mkDerivation (self : {
pname = "happy";
version = "1.18.5"; # Haskell Platform 2010.2.0.0
name = self.fname;
sha256 = "91e1c29ac42bc5cabcac2c2e28e693fc59fbdf30636e5c52cb51b779a74d755e";
extraBuildInputs = [perl];
propagatedBuildInputs = [mtl];
meta = {
description = "Happy is a parser generator for Haskell";
};
})