{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
        let mut bound_vars: smallvec::SmallVec<[ty::BoundVariableKind; 8]> =
            smallvec::SmallVec::with_capacity(tcx.generics_of(impl_ty.def_id).own_params.len());