Function run_id_member_candidates 

pub fn run_id_member_candidates(
    rewritten: &str,
    recv_offset: usize,
) -> Vec<Completion>

#2138: id after run. in a case body that hasn’t bound its own run — the test run’s identity. rewritten/recv_offset are value_receiver_rewrite’s output (recv_offset is the receiver’s last byte). Empty anywhere else.