{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
/// and the `prev_index_to_index` vector (which is more compact and faster than
/// mapping. `SerializedDepGraph` maps from `DepNode` to `SerializedDepNodeIndex`,
/// using a map) maps from `SerializedDepNodeIndex` to `DepNodeIndex`.