Enum LogLevel 

pub enum LogLevel {
    Trace,
    Debug,
    Info,
    Warn,
    Error,
    Off,
}

v1.4.73 BUG-015 fix：--log-level silent accept 非法值（tracing-subscriber EnvFilter::new() 对非法值返“deny-all“ filter 吞所有 log，exit=0 像正常跑 但用户看不到任何输出）。

用 clap ValueEnum 约束有效值集合（对齐 v1.4.40 LoginRegion 做法）， 非法值被 clap 在 parse 阶段拒绝 → exit=2 + 清晰错误输出。

有效值 = tracing 标准 LevelFilter / Level： trace / debug / info / warn / error / off。

Variants

Trace

最细粒度（含 tracing span entry/exit）

Debug

调试信息（默认最噪）

Info

标准运行日志（默认）

Warn

警告及以上

Error

只有错误

Off

关闭所有日志

Implementations

impl LogLevel

pub fn as_str(self) -> &'static str

Trait Implementations

impl Clone for LogLevel

fn clone(&self) -> LogLevel

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LogLevel

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LogLevel

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for LogLevel

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ValueEnum for LogLevel

fn value_variants<'a>() -> &'a [Self]

All possible argument values, in display order.

fn to_possible_value<'a>(&self) -> Option<PossibleValue>

The canonical argument value.

fn from_str(input: &str, ignore_case: bool) -> Result<Self, String>

Parse an argument into Self.

impl Copy for LogLevel