anchor.diff:            case Severity.nit:
               break;
             case Severity.warning:
  -            stderr.writeln(formatted);
  +            if (!suppressWarnings) stderr.writeln(formatted);
               break;
           }
         };
  
positive.code:   IncrementalKernelGenerator generator;
  
    IncrementalCompiler(FileSystem fileSystem, Uri platformKernel,
        {strongMode: false})
        : super(fileSystem, platformKernel, strongMode: strongMode);
  
    @override
    Future<Program> compileInternal(Uri script) async {
  
negative.code:     // isolate needs to receive a message indicating that particular
      // isolate was shut down. Message should be handled here in this script.
      compiler = new IncrementalCompiler(fileSystem, platformKernel,
          strongMode: strongMode, suppressWarnings: suppressWarnings);
      isolateCompilers[isolateId] = compiler;
    }
    return compiler;
  