Macro trace_call_result 

macro_rules! trace_call_result {
    ($trace:expr, $operation:expr) => { ... };
}

Record a fallible invocation according to the trace policy. 按追踪策略记录一个可失败的函数调用。

In errors-only mode, successful scopes are discarded and Err/panic scopes remain available for diagnostics. Other modes keep their normal behavior. 在 errors-only 模式下成功作用域会回滚，Err 或 panic 作用域会保留供诊断； 其它模式保持正常收集行为。