Macro eventd::event

macro_rules! event {
    (
        $name:ident
        $(< $lt:lifetime >)? => Fn($($arg_name:ident : $arg_ty:ty),*)
        $(+ $bound:tt)*
    ) => { ... };
    (
        $name:ident
        $(< $lt:lifetime >)? => FnMut($($arg_name:ident : $arg_ty:ty),*)
        $(+ $bound:tt)*
    ) => { ... };
    (
        $name:ident
        $(< $lt:lifetime >)? => FnOnce($($arg_name:ident : $arg_ty:ty),*)
        $(+ $bound:tt)*
    ) => { ... };
}