{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"'pop_finished_subtrees:"}]}
        'pop_finished_subtrees: while let Some(&subtree_idx) = subtrees_stack.last() {
    while i < tt.len() {
            let tt::TokenTree::Subtree(subtree) = &tt[subtree_idx] else {