anchor.diff:        await Process.run(executable, arguments, runInShell: runInShell);
     if (processResult.exitCode != 0) {
       final command =
  -        ([executable]..addAll(arguments)).map(simpleShellSingleQuote).join(" ");
  +        [executable, ...arguments].map(simpleShellSingleQuote).join(" ");
       throw new Exception("Command exited ${processResult.exitCode}: $command\n"
           "${processResult.stdout}\n${processResult.stderr}");
     }
  
positive.code:             "as baseline instead of $commit for $builder");
          inexactBuilds[builder] = buildSearchResult.commit;
        }
        final buildNumber = buildSearchResult.build;
        print("Downloading results from builder $builder build $buildNumber...");
        await cpGsutil(
            buildFileCloudPath(builder, buildNumber.toString(), "results.json"),
            "${outDirectory.path}/previous.json");
        await cpGsutil(
            buildFileCloudPath(builder, buildNumber.toString(), "flaky.json"),
            "${outDirectory.path}/flaky.json");
        print("Downloaded baseline results from builder $builder");
        // Merge the results for the builders.
        if (2 <= builders.length) {
          mergedResults
              .addAll(await loadResultsMap("${outDirectory.path}/previous.json"));
          mergedFlaky
              .addAll(await loadResultsMap("${outDirectory.path}/flaky.json"));
        }
      }
  
      // Write out the merged results for the builders.
      if (2 <= builders.length) {
        await new File("${outDirectory.path}/previous.json").writeAsString(
            mergedResults.values.map((data) => jsonEncode(data) + "\n").join(""));
        await new File("${outDirectory.path}/flaky.json").writeAsString(
            mergedFlaky.values.map((data) => jsonEncode(data) + "\n").join(""));
      }
  
negative.code:   }
    final namedConfiguration = namedConfigurations.single;
    final localConfiguration =
        options["local-configuration"] as String ?? namedConfiguration;
    for (final builder in builders) {
      if (localConfiguration != namedConfiguration) {
        print("Testing the named configuration $localConfiguration "
  