Enum EngineReaction 

#[repr(C)]
pub enum EngineReaction<'a> {
    Journaled(Journaled<'a>),
    Directive(Directive<'a>),
}

Variants

Journaled(Journaled<'a>)

A notice that something has just happened within the engine.

Directive(Directive<'a>)

An order for something that must now happen outside the engine.