https://juejin.cn/post/6942005360416784397

    1. go get golang.org/x/tools/cmd/stringer

    //go:generate stringer -type ErrCode -linecomment

    1. type Pill int
    3. const (
    4.     Placebo Pill = iota
    5.     Aspirin
    6.     Ibuprofen
    7.     Paracetamol
    8.     Acetaminophen = Paracetamol
    9. )
    11. //go:generate stringer -type Pill