y/error.go
func AssertTruef(b bool, format string, args ...interface{}) {
	if !b {
		log.Fatalf("%+v", errors.Errorf(format, args...))
	}
}
func AssertTruef(b bool, format string, args ...interface{}) {
	if !b {
		log.Fatalf("%+v", errors.Errorf(format, args...))
	}
}
func AssertTruef ( b bool , format string , args ... interface { } ) { if ! b { log . Fatalf ( " " , errors . Errorf ( format , args ... ) ) } }
// AssertTruef is AssertTrue with extra info.
AssertTruef is AssertTrue with extra info .