pub fn filter(&self) -> String {
        self.filter_handle
            .with_current(|filter| filter.to_string())
            .expect("the subscriber is not dropped before the component is")
    }
/// Return the currently-active tracing filter.
Return the currently-active tracing filter.
Return the currently - active tracing filter .
pub fn filter(&self) -> String {
        self.filter_handle
            .with_current(|filter| filter.to_string())
            .expect("the subscriber is not dropped before the component is")
    }
pub fn filter ( & self ) -> String { self . filter_handle . with_current ( | filter | filter . to_string ( ) ) . expect ( " " ) }
Return the currently-active tracing filter.
Return the currently - active tracing filter .
&self