{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"collector.submodules.push(CRATE_OWNER_ID);"}]}
    collector.submodules.push(CRATE_OWNER_ID);
    // the former needs to collect it. ItemCollector does not do this for us.
    tcx.hir_walk_toplevel_module(&mut collector);