Module backend 

Host backends: what the game answers the API with.

Enums

ActionOutcome

What a fake player’s action did once it ran.

ActionRefused

Why a fake player’s perform_action did nothing at all: it was refused before any of the action ran.

Traits

NoBackend

An error a handle method answers when its host has no game behind it (a mod’s test double): what a Result-returning helper refuses with, as None and false are for the others.