anchor.diff:          ''' + cs_install_section, "-"))
       .catchError((e) {
           print("DartContentShellDev: ${e} ${e.stackTrace}");     // Finally, callback fires.
  +        exitCode = 2;
           return -1;
         })
       .then((_) => writeCaskWithCs(outputDirectory, "DartContentShellEdge", "dart-content-shell-edge.rb", client, raw_root_url, "dartium/content_shell-macos-ia32-release.zip",  '''
  
positive.code:         ''' + cs_install_section, "-"))
      .catchError((e) {
          print("DartContentShellStable: ${e} ${e.stackTrace}");     // Finally, callback fires.
          return -1;
        })
      .then((_) {
  
negative.code:         ''' + dart_install_section, "-"))
      .catchError((e) {
          print("DartEditorEdge: ${e} ${e.stackTrace}");     // Finally, callback fires.
          exitCode = 2;
          return -1;
        })
      .then((_) => writeCaskWithCs(outputDirectory, "DartEditorEdgeCs", "dart-editor-edge-cs.rb", client, raw_root_url, "editor/darteditor-macos-x64.zip",  '''
  