{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"mcx.increase_complexity_level(matrix.rows().len())?;"}]}
        mcx.increase_complexity_level(matrix.rows().len())?;
    let Some(place) = matrix.head_place() else {
        // The base case: there are no columns in the matrix. We are morally pattern-matching on ().