Struct PotionBrewPreEvent 

pub struct PotionBrewPreEvent<'a> {
    pub pos: [i32; 3],
    pub stacks: &'a mut [Option<ItemStack>; 5],
    pub cancelled: bool,
}

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

Fields

pos: [i32; 3]

stacks: &'a mut [Option<ItemStack>; 5]

cancelled: bool

Whether the event is cancelled: by the game or an earlier listener, or by this one setting it. Only a listener that receives cancelled events (#[listener(receive_cancelled)]) sees true, and setting it back to false lets the game’s behaviour run.