From 6d6bfacdc707e14567bf974c7608403c0dc80d52 Mon Sep 17 00:00:00 2001
From: Jens Petersen <juhpetersen@gmail.com>
Date: Sat, 25 Jan 2020 00:52:53 +0800
Subject: [PATCH] reenable rank2classes (#5095)

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9a157d22..c561e2ca 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -921,7 +921,7 @@ packages:
         - incremental-parser
         - monoid-subclasses
         - picoparsec < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
-        - rank2classes < 0 # via template-haskell-2.15.0.0
+        - rank2classes
 
     "Brent Yorgey <byorgey@gmail.com> @byorgey":
         - active