Travis: test with GHC 7.4 and 7.6

Author: UnkindPartition

.travis.yml

@@ -1,3 +1,5 @@
-language: haskell
+env:
+ - GHCVER=7.4.2
+ - GHCVER=7.6.3
 install: /bin/true
 script: ./ci-test

ci-test

@@ -2,10 +2,17 @@
 
 set -e
 
+sudo add-apt-repository -y ppa:hvr/ghc
+sudo apt-get update
+sudo apt-get install cabal-install-1.18 ghc-$GHCVER happy
+export PATH=$HOME/.cabal/bin:/opt/ghc/$GHCVER/bin:$PATH
+
+cabal-1.18 update
+
 for i in core hunit quickcheck smallcheck core-tests
 do
   cd $i
-  cabal install
+  cabal-1.18 install
   cd ..
 done