func (b *multiLogger) SetLevel(level Level, module string) {
	for _, backend := range b.backends {
		backend.SetLevel(level, module)
	}
}
func (b *multiLogger) SetLevel(level Level, module string) {
	for _, backend := range b.backends {
		backend.SetLevel(level, module)
	}
}
func ( b * multiLogger ) SetLevel ( level Level , module string ) { for _ , backend := range b . backends { backend . SetLevel ( level , module ) } }
// SetLevel propagates the same level to all backends.
SetLevel propagates the same level to all backends .