anchor.diff:  import "fmt"
   
   func main() {
  -  fmt.Println("Hello, Go!")
  +      fmt.Println("Hello, Go!")
   }""";
   
   const String startingJavaCode = """// Do not change the name of this class
  
positive.code:     'autoCloseTags': true,
      'mode': 'clike',
      'matchBrackets': true,
      'extraKeys': {
        'Ctrl-Space': 'autocomplete',
        'Cmd-/': 'toggleComment',
  
negative.code:       ..contentEditable = "false";
      textArea.classes.add('code-editor-text-area');
      target.children..add(runBtn)..add(output);
      this.options = options == null ? this.options : options;
      _editor = new CodeMirror.fromTextArea(textArea, options: this.options);
      output
        ..text = "output"
  