{"ast_node_type":"impl","tokens":[{"end":68,"kind":"keyword","start":0,"text":"extra_bounds:"}]}
        extra_bounds: impl IntoIterator<Item = OutlivesBound<'tcx>>,
        known_type_outlives: Vec<ty::PolyTypeOutlivesPredicate<'tcx>>,
        higher_ranked_assumptions: FxHashSet<ty::ArgOutlivesPredicate<'tcx>>,