{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"impl<'a,"}]}
        impl<'a, 'tcx> GenericArgsLowerer<'a, 'tcx> for GenericArgsCtxt<'a, 'tcx> {
            fn args_for_def_id(&mut self, did: DefId) -> (Option<&'a GenericArgs<'tcx>>, bool) {