func (logger Logger) Log(lvl Level, msg string, fields ...Field) {
	status := logger.lgr.IsLevelEnabled(lvl)
	if status.Enabled {
		rec := NewLogRec(lvl, logger, msg, fields, status.Stacktrace)
		logger.lgr.enqueue(rec)
	}
}
Log checks that the level matches one or more targets, and
if so, generates a log record that is added to the Logr queue.
Arguments are handled in the manner of fmt.Print.
package logr
import "log"
type Logger struct {
	lgr    *Logr
	fields []Field
}
func (logger Logger) Logr() *Logr {
	return logger.lgr
}
func (logger Logger) With(fields ...Field) Logger {
	l := Logger{lgr: logger.lgr}
	size := len(logger.fields) + len(fields)
	if size > 0 {
		l.fields = make([]Field, 0, size)
		l.fields = append(l.fields, logger.fields...)
		l.fields = append(l.fields, fields...)
	}
	return l
}
func (logger Logger) StdLogger(level Level) *log.Logger {
	return NewStdLogger(level, logger)
}
func (logger Logger) IsLevelEnabled(level Level) bool {
	status := logger.Logr().IsLevelEnabled(level)
	return status.Enabled
}
func (logger Logger) Sugar(fields ...Field) Sugar {
	return Sugar{
		logger: logger.With(fields...),
	}
}