anchor.diff:  
     fish = stdenv.mkDerivation rec {
       pname = "fish";
  -    version = "3.1.1";
  +    version = "3.1.2";
   
       src = fetchurl {
         # There are differences between the release tarball and the tarball GitHub
  
positive.code:       # --version`), as well as the local documentation for all builtins (and
        # maybe other things).
        url = "https://github.com/fish-shell/fish-shell/releases/download/${version}/${pname}-${version}.tar.gz";
        sha256 = "1f12c56v7n4s0f9mi9xinviwj6kpwlcjwaig1d4vsk5wlgp7ip07";
      };
  
      # We don't have access to the codesign executable, so we patch this out.
  
negative.code:       homepage = "http://fishshell.com/";
        license = licenses.gpl2;
        platforms = platforms.unix;
        maintainers = with maintainers; [ ocharles cole-h ];
      };
  
      passthru = {
  