From e436b73f3687b7cbca3f2ab63d9d753660aabbce Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@well-typed.com>
Date: Sun, 20 Sep 2020 17:08:31 -0400
Subject: hadrian: Add extra-deps: happy-1.20 to stack.yaml

GHC now requires happy-1.20, which isn't available in LTS-16.14.

Fixes #18726.
---
 hadrian/stack.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hadrian/stack.yaml b/hadrian/stack.yaml
index c9324108ba..44acdf5246 100644
--- a/hadrian/stack.yaml
+++ b/hadrian/stack.yaml
@@ -12,3 +12,6 @@ nix:
    - git
    - ncurses
    - perl
+
+extra-deps:
+- happy-1.20.0
-- 
cgit v1.2.1