Example of implicit interface implementations in Go

typesInterfaces.go

// A Doer is anything that will Do something
type Doer interface {
  Do()
}

// X needs a Doer
func X(doer Doer) {
  doer.Do()
}

// Y will Do something, and is therefore a Doer
type Y string
func (y Y) Do() {
  // Does something
}

func main() {
  var y Y = "meep"
  X(y)
}