anchor.diff:  /// Command runner.
   TestResult runCommand(List<String> cmd, Map<String, String> env) {
     ProcessResult res = Process.runSync(
  -      'timeout', ['-s', '$sigkill', '$timeout'] + cmd,
  +      'timeout', ['-s', '$sigkill', '$timeout', ...cmd],
         environment: env);
     if (debug) {
       print('\nrunning $cmd yields:\n'
  
positive.code:     snapshot = '$tmp/snapshot';
      env = Map<String, String>.from(e);
      env['DART_CONFIGURATION'] = tag;
      cmd = [precompiler] + extraFlags + [fileName, snapshot];
    }
  
    TestResult run() {
  
negative.code:     description = '$prefix-$tag';
      dart = '$top/out/$tag/dart';
      if (kbcSrc) {
        cmd = [dart, ...extraFlags, fileName];
      } else {
        generate = '$top/pkg/vm/tool/gen_kernel';
        platform = '--platform=$top/out/$tag/vm_platform_strong.dill';
        dill = '$tmp/out.dill';
        cmd = [dart, ...extraFlags, dill];
      }
    }
  
  