Macro raui_core::widget_hook

macro_rules! widget_hook {
    {
        $vis:vis $name:ident
        $( ( $( $param:ident ),+ ) )?
        $([ $( $hook_pre:path ),+ $(,)? ])?
        $(|[ $( $hook_post:path ),+ $(,)? ])?
        $code:block
    } => { ... };
}