From 5ba85942017349169c3860ac79791db9d0c65c29 Mon Sep 17 00:00:00 2001
From: Alexey Zabelin <hello@alexeyzabelin.com>
Date: Fri, 7 Dec 2018 11:59:44 -0500
Subject: [PATCH] Add upper bound for haskell-src-exts, #4214

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 63ce00df..797c02de 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3885,6 +3885,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/4196
         - tasty < 1.2
 
+        # https://github.com/commercialhaskell/stackage/issues/4214
+        - haskell-src-exts < 1.21
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of