Function simple_logger::init_by_env

pub fn init_by_env()

A macro for simulating env_logger behavior, which enables the user to choose log level by setting a RUST_LOG environment variable. The RUST_LOG is not set or its value is not recognized as one of the log levels, this function with use the Error level by default.

simple_logger::init_by_env();
warn!("This is an example message.");