{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
                        let unsize_to = fold_regions(tcx, ty, |r, _| {
                        let is_implicit_coercion = coercion_source == CoercionSource::Implicit;
                            if let ty::ReVar(_) = r.kind() { tcx.lifetimes.re_erased } else { r }