{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"if"}]}
                if let hir_def::GeneralConstId::ConstId(c) = const_id {
                let mut subst = subst.clone();
                    let (c, s) = lookup_impl_const(self.db, self.trait_env.clone(), c, subst);