{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"match"}]}
        match self.impl_trait_ref(def_id) {
    pub fn impl_subject(self, def_id: DefId) -> EarlyBinder<'tcx, ImplSubject<'tcx>> {
            Some(t) => t.map_bound(ImplSubject::Trait),