{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
    let Some(undo_info) = undo_info.original.as_deref() else { return };
pub(crate) fn reverse_fixups(tt: &mut TopSubtree, undo_info: &SyntaxFixupUndoInfo) {
    let undo_info = &**undo_info;