From cbfa57b86b7eccdca562fd3d878313ec9fabd761 Mon Sep 17 00:00:00 2001
From: HaskellZhangSong <Haskell.Zhang.Song@hotmail.com>
Date: Thu, 8 Oct 2020 23:34:07 +0800
Subject: [PATCH] add derive-topdown

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

diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1dba1a61..1c60e78f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4396,6 +4396,9 @@ packages:
         - zenacy-html
         - zenacy-unicode
 
+    "Song Zhang <HaskellZhangSong@hotmail.com> @HaskellZhangSong":
+        - derive-topdown
+
     "Grandfathered dependencies":
         - Boolean
         - Decimal