Logger

In std/io/logging.

type Logger { name : String level : LogLevel // the least severe level it writes }

A producer of events: its name and the least severe level it writes. Its destination is not a field: what a logger writes to is visible only where it is constructed.

fn Logger<F : Format, L : LogLevel>(to: Writable, format: Type<F>, *, name: String, level: Type<L> = Info) : Logger

A Logger named name that writes to to in format each event at least as severe as level, Info unless written. The format is omitted for a Channel<LogEvent>, which takes the events as values. Construction is pure and writes nothing: Logger(stderr, Text, name = "birds").