Function retrying::override_by_env

pub fn override_by_env<T: FromStr>(original: T, prefix: &str, name: &str) -> T

read retrying environment using prefix and name and return the value from environment if it exists and has correct format. Otherwise method prints error to stderr and returns original value. This method is a part of developer API and should not be used directly (it is public because retry macros uses it together with envs_prefix configuration option).