Constant HURRAY_ERR_SINK_CLOSED 

pub const HURRAY_ERR_SINK_CLOSED: HurrayStatus = -15;

The sink accepted zero bytes while an item was in flight.

Distinct from HURRAY_ERR_TRANSPORT: a truncated item is already on the wire, so the writer is poisoned and no further call on it can succeed (ADR-041 § 4).