anchor.diff:  , targetPackages, fetchpatch, bash
   , dmdBootstrap ? callPackage ./bootstrap.nix { }
   , HOST_DMD ? "${dmdBootstrap}/bin/dmd"
  -, version ? "2.091.1"
  -, dmdSha256 ? "0brz0n84jdkhr4sq4k91w48p739psbhbb1jk2pi9q60psmx353yr"
  -, druntimeSha256 ? "0smgpmfriffh110ksski1s5j921kmxbc2zjy0dyj9ksyrxbzklbl"
  -, phobosSha256 ? "1n00anajgibrfs1xzvrmag28hvbvkc0w1fwlimqbznvhf28rhrxs"
  +, version ? "2.095.1"
  +, dmdSha256 ? "sha256:0faca1y42a1h16aml4lb7z118mh9k9fjx3xlw3ki5f1h3ln91xhk"
  +, druntimeSha256 ? "sha256:0ad4pa5llr9m9wqbvfv4yrcra4zz9qxlh5kx43mrv48f9bcxm2ha"
  +, phobosSha256 ? "sha256:04w6jw4izix2vbw62j13wvz6q3pi7vivxnmxqj0g8904j5g0cxjl"
   }:
   
   let
  
positive.code:   })
    ];
  
    patchFlags = [ "--directory=dmd" "-p1" "-F3" ];
    patches = [
      (fetchpatch {
       url = "https://github.com/dlang/dmd/commit/4157298cf04f7aae9f701432afd1de7b7e05c30f.patch";
       sha256 = "0v4xgqmrx5r8vbx5a4v88s0xnm23mam9nm99yfga7s2sxr0hi5p2";
      })
      (fetchpatch {
       url = "https://github.com/dlang/dmd/commit/1b8a4c90b040bf2f0b68a2739de4991315580b13.patch";
       sha256 = "1iih6aalv4fsw9mbrlrybhngkkchzzrzg7q8zl047w36c0x397cs";
      })
    ];
  
    sourceRoot = ".";
  
    # https://issues.dlang.org/show_bug.cgi?id=19553
  
negative.code: 
    postPatch = ''
        substituteInPlace dmd/test/dshell/test6952.d --replace "/usr/bin/env bash" "${bash}/bin/bash"
  
        rm dmd/test/runnable/gdb1.d
        rm dmd/test/runnable/gdb10311.d
        rm dmd/test/runnable/gdb14225.d
        rm dmd/test/runnable/gdb14276.d
        rm dmd/test/runnable/gdb14313.d
        rm dmd/test/runnable/gdb14330.d
        rm dmd/test/runnable/gdb15729.sh
        rm dmd/test/runnable/gdb4149.d
        rm dmd/test/runnable/gdb4181.d
    ''
    + lib.optionalString stdenv.hostPlatform.isLinux ''
        substituteInPlace phobos/std/socket.d --replace "assert(ih.addrList[0] == 0x7F_00_00_01);" ""
  