From 28f5d22434a040cac6969c37b648cd46579ae34d Mon Sep 17 00:00:00 2001
From: AlexKnauth <alexander@knauth.org>
Date: Sat, 5 Dec 2015 01:29:47 -0500
Subject: [PATCH] require unstable/contract

---
 unstable/lens/substring.rkt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unstable/lens/substring.rkt b/unstable/lens/substring.rkt
index 2eccc20..0d167f3 100644
--- a/unstable/lens/substring.rkt
+++ b/unstable/lens/substring.rkt
@@ -1,6 +1,6 @@
 #lang racket/base
 
-(require racket/contract/base)
+(require racket/contract/base unstable/contract)
 
 (provide
  (contract-out