{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
        let num = tcx.create_crate_num(root.stable_crate_id()).map_err(|existing| {
        assert_eq!(self.metas.len(), tcx.untracked().stable_crate_ids.read().len());
            // Check for (potential) conflicts with the local crate