pub fn set_logger<M>(make_logger: M) -> Result<(), SetLoggerError> where
M: FnOnce(MaxLogLevelFilter) -> Box<Log>,
Sets the global logger.
make_logger closure is passed a
MaxLogLevel object, which the
logger should use to keep the global maximum log level in sync with the
highest log level that the logger will not ignore.
This function may only be called once in the lifetime of a program. Any log
events that occur before the call to
set_logger completes will be
This function does not typically need to be called manually. Logger
implementations should provide an initialization method that calls
use_std feature (enabled by default).