user_module_invoke() has been removed from core

user_module_invoke() has been removed from User module. It was originally added to allow manipulation of submitted user login form values by other modules and tests, but form values can be manipulated through standard Form API ways today.

hook_user_login() implementations

Hook implementations need to be updated, since the $edit parameter has been removed:

 /**
  * Implements hook_user_login().
  */
-function system_user_login(&$edit, $account) {
+function system_user_login($account) {

It was possible to use $edit to to a form redirect. Modules which were doing this should now add a submit callback to the login form instead and handle the redirect there.

User Authentication API

All existing calls to user_module_invoke() need to be replaced with module_invoke_all().

Drupal 7

$edit = array();
user_module_invoke('login', $edit, $account);

Drupal 8

module_invoke_all('user_login', $account);

See user_login_finalize() for reference.