anchor.diff:  
   let
   self = stdenv.mkDerivation rec {
  -  name = "mysql-${version}";
  -  version = "5.7.25";
  +  pname = "mysql";
  +  version = "5.7.27";
   
     src = fetchurl {
  -    url = "mirror://mysql/MySQL-5.7/${name}.tar.gz";
  -    sha256 = "0gvjcdnba7nf2dx3fbqk1qyg49zclfvaihb78l8h6qc08di1qxak";
  +    url = "mirror://mysql/MySQL-5.7/${pname}-${version}.tar.gz";
  +    sha256 = "1fhv16zr46pxm1j8vb8x8mh3nwzglg01arz8gnazbmjqldr5idpq";
     };
   
     preConfigure = stdenv.lib.optional stdenv.isDarwin ''
  
positive.code:   };
  
    meta = with stdenv.lib; {
      homepage = https://www.mysql.com/;
      description = "The world's most popular open source database";
      platforms = platforms.unix;
      license = with licenses; [
  
negative.code: { stdenv, fetchurl, cmake, bison, pkgconfig
  , boost, libedit, libevent, lz4, ncurses, openssl, protobuf, readline, zlib, perl
  , cctools, CoreServices, developer_cmds }:
  
  