From 346a4e17c77c7a6596803974a44c517a89576f7c Mon Sep 17 00:00:00 2001
From: Rob Rix <rob.rix@github.com>
Date: Tue, 13 Oct 2015 21:33:24 -0400
Subject: [PATCH] Categorizable types have `categories`.

---
 prototype/Doubt/Category.swift | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/prototype/Doubt/Category.swift b/prototype/Doubt/Category.swift
index 1345ff3c0..ae16e3237 100644
--- a/prototype/Doubt/Category.swift
+++ b/prototype/Doubt/Category.swift
@@ -56,4 +56,6 @@ public func < (left: Category, right: Category) -> Bool {
 // MARK: - Categorizable
 
 /// A type whose values belong to a set of categories.
-public protocol Categorizable {}
+public protocol Categorizable {
+	var categories: Set<Category> { get }
+}