FirebaseEmailAuthUI/Sources/FUIEmailAuth.m [369:387]:
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    FIRAuthCredential *credential =
        [FIREmailAuthProvider credentialWithEmail:email link:self.emailLink];

    void (^completeSignInBlock)(FIRAuthDataResult *, NSError *) = ^(FIRAuthDataResult *authResult,
                                                                    NSError *error) {
      if (error) {
        switch (error.code) {
          case FIRAuthErrorCodeWrongPassword:
            [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_WrongPasswordError)];
            return;
          case FIRAuthErrorCodeUserNotFound:
            [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_UserNotFoundError)];
            return;
          case FIRAuthErrorCodeUserDisabled:
            [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_AccountDisabledError)];
            return;
          case FIRAuthErrorCodeTooManyRequests:
            [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_SignInTooManyTimesError)];
            return;
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FirebaseEmailAuthUI/Sources/FUIEmailAuth.m [416:434]:
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  FIRAuthCredential *credential =
  [FIREmailAuthProvider credentialWithEmail:email link:self.emailLink];

  void (^completeSignInBlock)(FIRAuthDataResult *, NSError *) = ^(FIRAuthDataResult *authResult,
                                                                  NSError *error) {
    if (error) {
      switch (error.code) {
        case FIRAuthErrorCodeWrongPassword:
          [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_WrongPasswordError)];
          return;
        case FIRAuthErrorCodeUserNotFound:
          [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_UserNotFoundError)];
          return;
        case FIRAuthErrorCodeUserDisabled:
          [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_AccountDisabledError)];
          return;
        case FIRAuthErrorCodeTooManyRequests:
          [FUIAuthBaseViewController showAlertWithMessage:FUILocalizedString(kStr_SignInTooManyTimesError)];
          return;
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