From 9b7b75416e6d65535aafa29fa208202584761c4f Mon Sep 17 00:00:00 2001
From: Jens Petersen <juhpetersen@gmail.com>
Date: Wed, 26 Apr 2017 17:44:11 +0900
Subject: [PATCH] lens-4.15.2 breaks active and transitively diagrams
 (diagrams/active#20)

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9eaace11..5bcca5c7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3113,6 +3113,9 @@ packages:
 
         # https://github.com/fpco/stackage/issues/2469
         - cryptonite < 0.23
+
+        # https://github.com/diagrams/active/issues/20
+        - lens < 4.15.2
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of