{"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"if"}]}
        if let ty::BoundVariableKind::Region(kind) = bound_var {
    for (idx, bound_var) in bound_vars.iter().enumerate() {
            let kind = ty::LateParamRegionKind::from_bound(ty::BoundVar::from_usize(idx), kind);