message: Implement draft for CallToken
diff: @@ -496,6 +496,10 @@ export const plugin: Plugin = {
  case 'filter':
  result += `:${token.val}`;
  break;
  + case 'call':
  + result += indent;
  + result += `+${token.val}(${token.args})`;
  + break;
  default:
  throw new Error('Unhandled token: ' + JSON.stringify(token));
  }
  