{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"enter_trace_span!(M,"}]}
            enter_trace_span!(M, step::init_fn_call, tracing_separate_thread = Empty, ?fn_val)
        let _span =
                .or_if_tracing_disabled(|| trace!("init_fn_call: {:#?}", fn_val));