Showing variable shadowing gotcha

err.go

import (
  "fmt"
  "errors"
)

func main() {
  var err error
  var doIt = true
  if doIt {
    ret, err := mayError()
    if err == nil {
      fmt.Printf("%s",ret)
    }
  }
  fmt.Printf("%t", err == nil)
}

func mayError() (string, error) {
  return "",errors.New("failed")
}