{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"for"}]}
        for (predicate, cause) in &fcx_typeck_results.coroutine_stalled_predicates {
        assert_eq!(fcx_typeck_results.hir_owner, self.typeck_results.hir_owner);
            let (predicate, cause) =