From 104d3c393f2efdf7ba1de8ea566dd89324c46491 Mon Sep 17 00:00:00 2001
From: Michael Snoyman <michael@snoyman.com>
Date: Sun, 18 Jun 2017 07:48:47 +0300
Subject: [PATCH] Upper bound for #2587

---
 build-constraints.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5b7c48eb..203d1d45 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3258,6 +3258,9 @@ packages:
         - QuickCheck < 2.10
         - these < 0.7.4
 
+        # https://github.com/fpco/stackage/issues/2587
+        - extra < 1.6
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of