{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
    let negative = impl_data.flags.contains(ImplFlags::NEGATIVE);
    let where_clauses = convert_where_clauses(db, impl_id.into(), &bound_vars);
    let polarity = if negative { rust_ir::Polarity::Negative } else { rust_ir::Polarity::Positive };