def Headers.written.done
import bend-trace-context@0.2.0.0/native_http.bend as NativeHttpimport Base
import bend-trace-context@0.2.0.0/trace_context.bend as TC
127# The source's final state with a message sent under `policy` and its map.
128def Headers.written.done(-S: Type, +policy: TC.FailurePolicy, done: S & TC.FailurePolicy.result(policy, TC.Sent)) ->
129 S & TC.FailurePolicy.result(policy, Outbound):
130 (source, result) = done
131 (source, Headers.written(policy, result))