anchor.diff:  
       return Command.compilation('remove_assembly', tempDir,
           bootstrapDependencies(buildDir), exec, args, environmentOverrides,
  -        alwaysCompile: !useSdk);
  +        alwaysCompile: !_useSdk);
     }
   
     List<String> filterVmOptions(List<String> vmOptions) {
  
positive.code: }
  
  class AnalyzerCompilerConfiguration extends CompilerConfiguration {
    AnalyzerCompilerConfiguration(
        {bool isDebug,
        bool isChecked,
        bool isStrong,
        bool isHostChecked,
        bool useSdk})
        : super._subclass(
              isDebug: isDebug,
              isChecked: isChecked,
              isStrong: isStrong,
              isHostChecked: isHostChecked,
              useSdk: useSdk);
  
    int get timeoutMultiplier => 4;
  
    String computeCompilerPath(String buildDir) {
      var prefix = 'sdk/bin';
      String suffix = executableScriptSuffix;
      if (isHostChecked) {
        if (useSdk) {
          throw "--host-checked and --use-sdk cannot be used together";
        }
        // The script dartanalyzer_developer is not included in the
  
negative.code:       List<String> sharedOptions,
        List<String> originalArguments,
        CommandArtifact artifact) {
      var args = <String>[];
      if (_isChecked) {
        args.add('--enable_asserts');
        args.add('--enable_type_checks');
      }
  