Update guard_authentication.rst #7964
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"Or, extend the simpler :class:
Symfony\\Component\\Security\\Guard\\AbstractGuardAuthenticator
. This requires you to implement seven methods::" not six.GuardAuthenticatorInterface defines 8 methods, and AbstractGuardAuthenticator implements only the createAuthenticatedToken method:
http://api.symfony.com/3.2/Symfony/Component/Security/Guard/AbstractGuardAuthenticator.html
http://api.symfony.com/3.2/Symfony/Component/Security/Guard/AbstractGuardAuthenticator.html
Thanks!