Macro hooks_core::impl_hook

macro_rules! impl_hook {
    (
        impl $([ $($impl_generics:tt)* ])? for $ty:ty $(where [$($where:tt)*])? {
            $(#[$meta_poll:meta])*
            $poll_next_update:ident($($pat_args_poll:tt)*) $impl_poll:block

            $(

            $(#[$meta_use:meta])*
            $use_hook:ident
            $({$($args_lifetimes:tt)*})?
            $([$($args_generics:tt)*])?
            ( $self_0:ident $($self_1:ident)? $(, $arg_pat:ident : $arg_ty:ty)* $(,)? ) -> $value:ty $impl_use_hook:block

            )*
        }
    ) => { ... };
}