tasking/t.go
func (t *T) Logf(format string, args ...interface{}) {
	fmt.Printf(format, args...)
}
func (t *T) Logf(format string, args ...interface{}) {
	fmt.Printf(format, args...)
}
func ( t * T ) Logf ( format string , args ... interface { } ) { fmt . Printf ( format , args ... ) }
// Logf formats its arguments according to the format, analogous to Printf.
Logf formats its arguments according to the format analogous to Printf .