{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                    let (c, s) = lookup_impl_const(self.db, self.trait_env.clone(), c, subst);
                if let hir_def::GeneralConstId::ConstId(c) = const_id {
                    const_id = hir_def::GeneralConstId::ConstId(c);