anchor.diff:    final void Function() startLoginFlow;
     final void Function(
       String email,
  -    void Function(FirebaseAuthException e) error,
  +    void Function(Exception e) error,
     ) verifyEmail;
     final void Function(
       String email,
       String password,
  -    void Function(FirebaseAuthException e) error,
  +    void Function(Exception e) error,
     ) signInWithEmailAndPassword;
     final void Function() cancelRegistration;
     final void Function(
       String email,
       String displayName,
       String password,
  -    void Function(FirebaseAuthException e) error,
  +    void Function(Exception e) error,
     ) registerAccount;
     final void Function() signOut;
   
  
positive.code:             child: ListBody(
                children: <Widget>[
                  Text(
                    '${e.message}',
                    style: TextStyle(fontSize: 18),
                  ),
                ],
  
negative.code: import 'package:flutter/material.dart';
  
  import 'widgets.dart';
  
  