{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"combined_inverse_memory_index.raw.retain(|&i|"}]}
            combined_inverse_memory_index.raw.retain(|&i| i.index() != invalid_field_idx);
            // combined `memory_index` (also see previous comment).
            let combined_memory_index = combined_inverse_memory_index.invert_bijective_mapping();