anchor.diff:  
     # check based on https://github.com/bashup/events/blob/master/.dkrc
     checkPhase = ''
  +    runHook preCheck
       SHELLCHECK_OPTS='-e SC2016,SC2145' ${shellcheck}/bin/shellcheck ./bashup.events
       ${bash}/bin/bash -n ./bashup.events
       ${bash}/bin/bash ./bashup.events
  +    runHook postCheck
     '';
   
     solutions = {
  
positive.code: {
    # general
    lib
  , callPackage
  , runCommand
  , resholvePackage
  , bash
  , shellcheck
  
negative.code:   inherit src;
  
    installPhase = ''
      runHook preInstall
      install -Dt $out/bin bashup.events
      runHook postInstall
    '';
  
    inherit doCheck;
  