{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"self.tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(self.tcx,"}]}
                self.tcx.impl_trait_ref(impl_def_id).unwrap().instantiate(self.tcx, impl_args);
            let impl_trait_ref =
            let cause = self.misc(base_expr.span);