From e44a400ee911ab4cc0a89c8b91dcf847fb8c2112 Mon Sep 17 00:00:00 2001
From: Mihai Maruseac <mihai.maruseac@gmail.com>
Date: Sun, 1 Oct 2017 21:48:37 -0700
Subject: [PATCH] Another fix for #2920

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3ad975f6..e4f89988 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3426,7 +3426,7 @@ packages:
         - Glob < 0.9.0
 
         # https://github.com/fpco/stackage/issues/2920
-        - fingertree < 0.1.2
+        - reducers < 3.12.1
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of