anchor.diff:      maintainers = with maintainers; [ ollieB thoughtpolice ];
     };
   }))
  -
  -
  
positive.code: , yosys
  , zlib
  , yosys-symbiflow
  }: let
  
    src = fetchFromGitHub {
      owner  = "SymbiFlow";
      repo   = "yosys-symbiflow-plugins";
      rev    = "35c6c33811a8de7c80dff6a7bcf7aa6ec9b21233";
      hash   = "sha256-g5dX9+R+gWt8e7Bhbbg60O9qa+Vi6Ar0M1sHhYlAre8=";
    };
  
    version = "2022.01.06";
  
    # Supported symbiflow plugins.
    #
    # The following are disabled:
    #
    # "ql-qlf" builds but fails to load the plugin, so is not currently supported.
    #
    # "UHDM" doesn't currently build, as the work to package UHDM and surelog has
    # not (yet) been undertaken.
    plugins = [
      "design_introspection"
      "fasm"
  
negative.code:     # "ql-qlf"
      "sdc"
      "xdc"
      "systemverilog"
    ];
  
    static_gtest = gtest.dev.overrideAttrs (old: {
  