Update test script for travis.

Drop support for ghc-7.4.*. Add support for ghc-7.10.2 and ghc-HEAD.

.travis.yml

@@ -1,35 +1,34 @@
 # See: https://github.com/hvr/multi-ghc-travis
 
-# NB: don't set `language: haskell` here
-
-# The following enables several GHC versions to be tested; often it's enough to test only against the last release in a major GHC version. Feel free to omit lines listings versions you don't need/want testing for.
 env:
- - GHCVER=7.4.1
- - GHCVER=7.4.2
- - GHCVER=7.6.1
- - GHCVER=7.6.2
- - GHCVER=7.6.3
- - GHCVER=7.8.1 # see note about Alex/Happy
-# - GHCVER=head  # see section about GHC HEAD snapshots
+ - GHCVER=7.6.3 CABALVER=1.18
+ - GHCVER=7.8.4 CABALVER=1.18
+ - GHCVER=7.10.2 CABALVER=1.22
+ - GHCVER=head CABALVER=head
+
+matrix:
+  allow_failures:
+   - env: GHCVER=head CABALVER=head
 
 # Note: the distinction between `before_install` and `install` is not important.
 before_install:
  - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
  - travis_retry sudo apt-get update
- - travis_retry sudo apt-get install cabal-install-1.18 ghc-$GHCVER happy
- - export PATH=/opt/ghc/$GHCVER/bin:$PATH
+ - travis_retry sudo apt-get install -y cabal-install-$CABALVER ghc-$GHCVER
+ - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.cabal/bin:$PATH
+ - cabal --version
 
 install:
- - cabal-1.18 update
- - cabal-1.18 install --only-dependencies --enable-tests --enable-benchmarks
+ - cabal update
+ - cabal install --only-dependencies --enable-tests --enable-benchmarks
 
 # Here starts the actual work to be performed for the package under test; any command which exits with a non-zero exit code causes the build to fail.
 script:
- - cabal-1.18 configure --enable-tests --enable-benchmarks -v2  # -v2 provides useful information for debugging
- - cabal-1.18 build   # this builds all libraries and executables (including tests/benchmarks)
- - cabal-1.18 test
- - cabal-1.18 check
- - cabal-1.18 sdist   # tests that a source-distribution can be generated
+ - cabal configure --enable-tests --enable-benchmarks -v2  # -v2 provides useful information for debugging
+ - cabal build   # this builds all libraries and executables (including tests/benchmarks)
+ - cabal test
+ - cabal check
+ - cabal sdist   # tests that a source-distribution can be generated
 
 # The following scriptlet checks that the resulting source distribution can be built & installed
  - export SRC_TGZ=$(cabal-1.18 info . | awk '{print $2 ".tar.gz";exit}') ;