From c62c26aafd67e6c3f0db766358afe9a19e1fb546 Mon Sep 17 00:00:00 2001
From: David Wang <millimillenary@gmail.com>
Date: Sat, 18 Feb 2017 16:05:10 +1100
Subject: [PATCH] Add dependency: bit-set.

We will be using bit-sets to keep track of which puzzle variables are
used in which constraints, and which constraints need to be woken up.
---
 Cargo.toml | 1 +
 src/lib.rs | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 18f6d2d..c286ffd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,4 @@ authors = ["David Wang <millimillenary@gmail.com>"]
 license = "MIT"
 
 [dependencies]
+bit-set = "*"
diff --git a/src/lib.rs b/src/lib.rs
index 3f1cc4b..e49bfe5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,4 @@
 //! This crate searches for the solutions to logic puzzles.
 //! The puzzle rules are expressed as constraints.
+
+extern crate bit_set;