Struct Located 

pub struct Located {
    pub seq: Seq,
    pub run: Option<RunId>,
}

Where a line sits in the history and whose it is.

Fields

seq: Seq

run: Option<RunId>

None when the line names no run that reads back as one. The line is still indexed by seq: an index over a damaged ledger is exactly what a repair path needs, and a line dropped here would be invisible to every reader.