writer := WriteOnClose(io.Discard)
	if writer.HasWritten() {
		t.Error("WriteOnCloser must not be marked as HasWritten")
	}
	writer.Write(nil)
	if !writer.HasWritten() {
		t.Error("WriteOnCloser must be marked as HasWritten")
	}

	writer = WriteOnClose(io.Discard)
	writer.Close()
	if !writer.HasWritten() {
		t.Error("WriteOnCloser must be marked as HasWritten")
	}
}

// Test for AppendFile.

			if e != nil {
				return e
			}
			// Quote string...
			b, _ := json.Marshal(file.Name)
			if hasWritten {
				fmt.Print(",\n")
			}
			fmt.Printf("\t%s: ", string(b))

			b, e = decode(r, file.Name)
			if e != nil {
				return e
			}
			fmt.Print(string(b))
			hasWritten = true
		}
	}
	fmt.Println("")
	fmt.Println("}")

	return nil
}

var (