{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
            let mut parent = parent_idx.map(|parent_idx| &res.arena[parent_idx].1);
        fn parent_of(parent_idx: Option<ArenaId>, res: &AstIdMap) -> Option<&ErasedFileAstId> {
            if parent.is_some_and(|parent| parent.kind() == ErasedFileAstIdKind::ExternBlock as u32)