{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"debug_assert_eq!(prev,"}]}
        debug_assert_eq!(prev, None);
        let prev = self.fcx.checked_opaque_types_storage_entries.replace(Some(num_entries));
        for (opaque_type_key, hidden_type) in opaque_types {