func (g *Glg) Warn(val ...interface{}) error {
	return g.out(WARN, blankFormat(len(val)), val...)
}
func (g *Glg) Warn(val ...interface{}) error {
	return g.out(WARN, blankFormat(len(val)), val...)
}
func ( g * Glg ) Warn ( val ... interface { } ) error { return g . out ( WARN , blankFormat ( len ( val ) ) , val ... ) }
// Warn outputs Warn level log
Warn outputs Warn level log