anchor.diff:    writeScript,
     writeText,
     writePython3,
  +  system,  # Note: This is the cross system we're compiling for
   }:
   
   # WARNING: this API is unstable and may be subject to backwards-incompatible changes in the future.
  
positive.code:       streamScript = writePython3 "stream" {} ./stream_layered_image.py;
        baseJson = writeText "${name}-base.json" (builtins.toJSON {
           inherit config;
           architecture = buildPackages.go.GOARCH;
           os = "linux";
        });
  
  
negative.code:       baseJson = let
            pure = writeText "${baseName}-config.json" (builtins.toJSON {
              inherit created config;
              architecture = getArch system;
              os = "linux";
            });
            impure = runCommand "${baseName}-config.json"
  