anchor.diff:  , filepath, free, gitrev, happy, haskeline, language-c-quote
   , mainland-pretty, megaparsec, mtl, neat-interpolation, parallel
   , parser-combinators, pcg-random, process, process-extras
  -, QuickCheck, regex-tdfa, sexp-grammar, srcloc, stdenv, tasty
  -, tasty-hunit, tasty-quickcheck, template-haskell, temporary
  -, terminal-size, text, time, transformers, unordered-containers
  -, utf8-string, vector, vector-binary-instances, versions
  -, zip-archive, zlib
  +, QuickCheck, regex-tdfa, srcloc, stdenv, tasty, tasty-hunit
  +, tasty-quickcheck, template-haskell, temporary, terminal-size
  +, text, time, transformers, unordered-containers, utf8-string
  +, vector, vector-binary-instances, versions, zip-archive, zlib
   }:
   mkDerivation {
     pname = "futhark";
  -  version = "0.19.0";
  +  version = "0.20.0";
     src = ./.;
     isLibrary = true;
     isExecutable = true;
  
positive.code:     bytestring-to-vector cmark-gfm containers directory directory-tree
      dlist file-embed filepath free gitrev haskeline language-c-quote
      mainland-pretty megaparsec mtl neat-interpolation parallel
      pcg-random process process-extras regex-tdfa sexp-grammar srcloc
      template-haskell temporary terminal-size text time transformers
      unordered-containers utf8-string vector vector-binary-instances
      versions zip-archive zlib
  
negative.code:   libraryToolDepends = [ alex happy ];
    executableHaskellDepends = [ base text ];
    testHaskellDepends = [
      base containers megaparsec mtl parser-combinators QuickCheck tasty
      tasty-hunit tasty-quickcheck text
    ];
    homepage = "https://futhark-lang.org";
    description = "An optimising compiler for a functional, array-oriented language";
  