Function insert_item_loc 

fn insert_item_loc<ID, N, Data>(
    db: &dyn DefDatabase,
    res: &mut DynMap,
    file_id: HirFileId,
    id: ID,
    key: Key<N, ID>,
)
where
    ID: Lookup<Database = dyn DefDatabase, Data = Data> + 'static,
    Data: AstIdLoc<Ast = N>,
    N: AstIdNode + 'static,