Simplify custom setter examples

cli.go

@@ -27,10 +27,8 @@ type CLI struct {
 	// Here is an example which uses a custom layout for parsing any time.Time
 	// fields:
 	//
-	//  type CustomTimeSetter struct {
-	//  	value *time.Time
-	//  }
-	//  func (ts *CustomTimeSetter) Set(s string) error {
+	//  type customTime time.Time
+	//  func (t *customTime) Set(s string) error {
 	//  	parsed, err := time.Parse("2006-01-02 15:04", s)
 	//  	if err != nil {
 	//  		return err
@@ -42,7 +40,7 @@ type CLI struct {
 	//  cli.Setter = func(i interface{}) cli.Setter {
 	//  	switch v := i.(type) {
 	//  	case *time.Time:
-	//  		return &CustomTimeSetter{v}
+	//  		return (*customTime)(v)
 	//  	default:
 	//  		// return nil to fall back on default behavior
 	//  		return nil

cli_test.go

@@ -268,27 +268,25 @@ func TestCLIEnvLookupError(t *testing.T) {
 	assert.Error(t, r.Err)
 }
 
-type testTimeSetter struct {
-	t *time.Time
-}
+type customTime time.Time
 
-func (ts *testTimeSetter) Set(s string) error {
+func (t *customTime) Set(s string) error {
 	v, err := time.Parse(time.Kitchen, s)
 	if err != nil {
 		return err
 	}
-	*ts.t = v
+	*t = (customTime)(v)
 	return nil
 }
 
 func TestCLISetter(t *testing.T) {
 	b := &strings.Builder{}
 	cli := CLI{
 		ErrWriter: b,
-		Setter: func(i interface{}) setter {
+		Setter: func(i interface{}) Setter {
 			switch v := i.(type) {
 			case *time.Time:
-				return &testTimeSetter{v}
+				return (*customTime)(v)
 			default:
 				return nil
 			}