Struct MenuSlotRulesEvent 

pub struct MenuSlotRulesEvent<'a> {
    pub menu: &'a str,
    pub slot: usize,
    pub stack: &'a ItemStack,
    pub may_place: bool,
    pub max_stack: u32,
}

What MenuPart::menu_slot_rules is told. Each field is that hook’s argument of the same name, described in the hook’s doc.

Fields

menu: &'a str

slot: usize

stack: &'a ItemStack

may_place: bool

max_stack: u32