/*!
Using `env_logger`.
Before running this example, try setting the `MY_LOG_LEVEL` environment variable to `info`:
```no_run,shell
$ export MY_LOG_LEVEL = 'info'
```
*/#[macro_use]externcrate log;externcrate env_logger;fnmain(){env_logger::init_from_env("MY_LOG_LEVEL");trace!("some trace log");debug!("some debug log");info!("some information log");warn!("some warning log");error!("some error log");}