{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":")"}]}
) -> SmallVec<[&'tcx PolyTraitRef<'tcx>; 1]> {
    self_ty_where_predicates: Option<(LocalDefId, &'tcx [hir::WherePredicate<'tcx>])>,
    let mut relaxed_bounds: SmallVec<[_; 1]> = SmallVec::new();