From d9dd9beda1d88de68a7896b46044b43f87a6e447 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sat, 20 Jan 2018 10:37:16 -0800
Subject: appveyor.yml : use -fexternal-interpreter.

This is supposed to help with the segfaults that come from
use of TH.  See #4021.
---
 appveyor.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/appveyor.yml b/appveyor.yml
index 9401d6666..fb92275e1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,7 +3,8 @@ environment:
   global:
     WIXBIN: "c:\\Program Files (x86)\\WiX Toolset v3.11\\bin"
     STACK_YAML: "c:\\pandoc\\stack.yaml"
-    STACK_BUILD_OPTS: "-j1 --no-terminal --test --local-bin-path=.\\windows"
+    STACK_BUILD_OPTS: "-j1 --no-terminal --test --local-bin-path=.\\windows --ghc-options=-fexternal-interpreter"
+    # see #4201, https://github.com/haskell-tools/haskell-tools/issues/277
   matrix:
   - STACK_VERSION: "windows-i386"
     STACK_ROOT: "c:\\sr32"
-- 
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