Example code for PropertyDrawer doesn't work

This popped up in a thread recently. The C# version of the example code for PropertyDrawer dosn’t work:

using UnityEngine;
using System.Collections;

public enum IngredientUnit { Spoon, Cup, Bowl, Piece }

// Custom serializable class
public class Ingredient
{
    public string name;
    public int amount = 1;
    public IngredientUnit unit;
}

public class ExampleClass : MonoBehaviour
{
    public Ingredient potionResult;
    public Ingredient[] potionIngredients;
}

The example goes on to write a customPropertyDrawer for Ingredient, but since Ingredient isn’t marked as [Serializable], it won’t show up in the inspector, with or without the drawer.

Probably caused by automatic translation from UnityScript, where the [Serializable] tag is not neccessary.

Thanks as always… bug reported.