fn get_file_writer_layer<S>(
invocation: &Invocation,
formatter: LogEventFormatter,
directives: &str,
) -> Result<Box<dyn Layer<S> + Send + Sync + 'static>>where
S: Subscriber + for<'a> LookupSpan<'a>,fn get_file_writer_layer<S>(
invocation: &Invocation,
formatter: LogEventFormatter,
directives: &str,
) -> Result<Box<dyn Layer<S> + Send + Sync + 'static>>where
S: Subscriber + for<'a> LookupSpan<'a>,