anchor.diff:  
     checkPhase = ''
       make test
  +    # ./scripts/run-python-tests.sh # TODO: once typeshed and python bits are added
     '';
   
     # Note that we're not installing the typeshed yet.
     # Improvement for a future version.
     installPhase = ''
       mkdir -p $out/bin
  -    cp _build/all/main.native $out/bin/pyre
  +    cp _build/all/main.native $out/bin/pyre.bin
     '';
   
     meta = with stdenv.lib; {
  
positive.code: let
    # Manually set version - the setup script requires
    # hg and git + keeping the .git directory around.
    version = "0.0.8";
    versionFile = writeScript "version.ml" ''
      cat > "./version.ml" <<EOF
      let build_info () =
  
negative.code:     owner = "facebook";
      repo = "pyre-check";
      rev = "v${version}";
      sha256 = "17fk2izq434jsr8dfz828754356qdwa6zv0lbzm6z1kgq4jg7brv";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  