func (s stringer) String() string {
	return "stringer " + string(s)
}
String implements the Stringer interface for testing invocation of custom
stringers on types with non-pointer receivers.
package spew_test
import (
	"fmt"
	"reflect"
	"testing"
	"github.com/davecgh/go-spew/spew"
)
type stringer string