Struct FallbackHandler 

pub struct FallbackHandler;

The runtime types that appear in bevy-brink’s own public signatures, re-exported so consumers can name them without depending on brink-runtime: FlowInstance, Program, Choice, Step’s return, RuntimeError’s error, FallbackHandler for the “no bindings” advance path, the scoped story-state types a host needs to build a policy and a per-step routing view (see docs/scoped-flow-state-spec.md): WorldPolicy, Scope, PolicyError, and ContextView (usually built via flow_context_view instead of by hand) — and the per-entity durability types produced/consumed by BrinkGlobals::save_state/load_state and save_flow_state/load_flow_state (F6.3, see the globals module’s “Save/load” docs): SaveState and LoadReport.

World is deliberately absent here — it collides with bevy::prelude::World under a glob import, so it is re-exported under the alias BrinkWorld. Default handler that always falls back to the ink function body.

Use this as the handler argument to [FlowInstance::step_single_line] or [FlowInstance::choose] when you don’t want to provide a custom external-function binding registry. Every external call returns ExternalResult::Fallback, delegating to the in-story fallback container declared on the EXTERNAL declaration.

Trait Implementations

impl ExternalFnHandler for FallbackHandler

fn call(&self, _name: &str, _args: &[Value]) -> ExternalResult

Handle an external function call.