message: Handle mustEscape for buffered code token
diff: @@ -451,6 +451,9 @@ export const plugin: Plugin = {
  break;
  case 'code':
  result = printIndent(previousToken, result, indent, indentLevel);
  + if (!token.mustEscape && token.buffer) {
  + result += '!';
  + }
  result += token.buffer ? '=' : '-';
  result += ` ${token.val}`;
  break;
  