fsel

Linter: fsel flags field access with unverified nil errors.

func bad() error {
  s, err := doSomething()
  fmt.Println(s.X) // <- field address without checking nilness of err
  return err
}

func good() error {
  s, err := doSomething()
  if err != nil {
    return err
  }
  fmt.Println(s.X) // ok because err is definitely nil
  return nil
}

func doSomething() (*S, error) {
  return nil, errors.New("error")
}

type S struct {
  X int
}

You can try an example by running make run.example.

How to use

go install github.com/qawatake/fsel/cmd/fsel@latest
fsel ./...