anchor.diff:  import 'package:flutter/material.dart';
  -import 'package:firebase_auth/firebase_auth.dart' show FirebaseAuthException;
   
   import 'widgets.dart';
   
  
positive.code:     }
    }
  
    void _showErrorDialog(
        BuildContext context, String title, FirebaseAuthException e) {
      showDialog<void>(
        context: context,
        builder: (BuildContext context) {
  
negative.code:   final void Function() startLoginFlow;
    final void Function(
      String email,
      void Function(Exception e) error,
    ) verifyEmail;
    final void Function(
      String email,
      String password,
      void Function(Exception e) error,
    ) signInWithEmailAndPassword;
    final void Function() cancelRegistration;
    final void Function(
      String email,
      String displayName,
      String password,
      void Function(Exception e) error,
    ) registerAccount;
    final void Function() signOut;
  
  