pub type BackendMaterializeFn = fn(&mut dyn Any, u64, Vec<u8>) -> Result<Box<dyn SlotValue>, BackendMaterializeError>;Expand description
Type alias for the BackendRuntime::materialize_from_wire
downcast-dispatch fn pointer. Mirrors ProtocolDispatchFn’s
erased-Any shape so the per-T closure stays callable from the
engine’s wire-decode hot path without re-doing the downcast lookup
on every fill.