{"ast_node_type":"variable","tokens":[{"end":31,"kind":"keyword","start":0,"text":"let"}]}
        let source_file_edits =
    fn from(source_file_edits: IntMap<FileId, TextEdit>) -> SourceChange {
            source_file_edits.into_iter().map(|(file_id, edit)| (file_id, (edit, None))).collect();