Method code for $robot<$event_handler>.hook_into_event()

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---

arg event;

if (!hooks)
    hooks = #[];
(> .will_hook(event, sender()) <);
hooks = dict_add(hooks, event, setadd((| hooks[event] |) || [], sender()));
hooked = (hooked || #[]).setadd_elem(sender(), event);
(| .did_hook(event, sender()) |);

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["// Created 16-Dec-1996 as a part of ColdCore, see: @help Credit"]