pub type EventResult<T> = Result<T, EventError>;

#[derive(Debug, Clone, PartialEq, Eq, thiserror::Error)]
pub enum EventError {
    #[error("the event bus is closed")]
    BusClosed,

    /// A wrong answer rather than a missing one so it must not be read as
    /// "dismissed"
    #[error("prompt answered with an unknown choice '{0}'")]
    UnknownChoice(&'static str),
}