From f3353c94ef0217b4ce26a446477bd8b89c9900a2 Mon Sep 17 00:00:00 2001
From: Victor Denisov <denisovenator@gmail.com>
Date: Fri, 4 Sep 2015 11:38:15 -0700
Subject: [PATCH] Use sandboxes for package build

Installation of cabal and hpc may cause dependency conflicts.
---
 .travis.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 0b543f3..53a8322 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,8 +27,9 @@ install:
  - travis_retry cabal update
  # Install the combined dependencies for this package and all other packages
  # needed to reduce conflicts.
- - cabal install --only-dependencies --enable-tests . hpc-coveralls
  - cabal install hpc-coveralls
+ - cabal sandbox init
+ - cabal install --only-dependencies --enable-tests . hpc-coveralls
 
 script:
  - cabal configure --enable-tests --enable-coverage -v2