From a30d6f0908c9599b4394a2cc2a463025b76867fc Mon Sep 17 00:00:00 2001
From: Michael Snoyman <michael@snoyman.com>
Date: Mon, 15 Dec 2014 07:52:23 +0200
Subject: [PATCH] Add missing mtl upper bound

---
 build-constraints.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-constraints.yaml b/build-constraints.yaml
index fe4b62a6..ac718ef9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -554,7 +554,7 @@ packages:
         - monad-products
         - monad-st
         - monad-st
-        - mtl
+        - mtl < 2.2
         - nats
         - numeric-extras
         - parsers