{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
        let PatOrWild::Pat(pat) = matrix.rows[child_row.parent_row].head() else { continue };
    for (child_row_id, child_row) in specialized_matrix.rows().enumerate() {
        let Constructor::IntRange(this_range) = pat.ctor() else { continue };