[go-nuts] var errors stdlib

[Sebastian Bogan]

Hello Everyone,

I was wondering, what was / is the reason for exposing errors as public 
vars - rather than constants? Doesn't that impose some risk?

For example:

  fs.ErrNotExist = errors.New("foo")
  _, err = os.ReadFile("./invalid")
  if !errors.Is(err, fs.ErrNotExist) {
    fmt.Println("is NOT fs.ErrNotExist")
  }

Would something like the following work (and be less risky)?:

  type ConstError string
  func (e ConstError) Error() string {
    return string(e)
  }
  const ErrNotExist = ConstError("file does not exist")

Thanks
Seb

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