From 18ed4695e04987e8fac40240f1f3ef6a4e064caa Mon Sep 17 00:00:00 2001
From: Mihai Maruseac <mihai.maruseac@gmail.com>
Date: Wed, 15 Sep 2021 21:44:04 -0700
Subject: [PATCH] Add an upper bound to `happy` due to #6242

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index ea97d449..9f4d4edc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6727,6 +6727,9 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/6237
       - lucid < 2.9.13
 
+      # https://github.com/commercialhaskell/stackage/issues/6242
+      - happy < 1.21
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of