Forgets one pipeline: its item and every specifier that resolved to it. Called when an item kept turns out not to answer (the pipeline was removed under the session), so the next ask resolves afresh.
The connection's chrisapi client.
The pipeline's id.
Forgets one pipeline: its item and every specifier that resolved to it. Called when an item kept turns out not to answer (the pipeline was removed under the session), so the next ask resolves afresh.