From 3d5dc6a3fe34621bcf8b848cbc2ceae795b9a8fd Mon Sep 17 00:00:00 2001
From: Adam Bergmark <adam@bergmark.nl>
Date: Mon, 14 Sep 2015 17:19:43 +0200
Subject: [PATCH] Upper bound for #831

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index b4a74f5d..f67361da 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1453,6 +1453,9 @@ packages:
         - reducers < 3.12
         - text-show < 2.1
 
+        # https://github.com/fpco/stackage/issues/831
+        - lens < 4.13
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: