4 - CABALVER=1.22 GHCVER=7.10.2
7 - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
8 - travis_retry sudo apt-get update
9 - travis_retry sudo apt-get install cabal-install-$CABALVER ghc-$GHCVER happy alex
10 - export PATH=$HOME/.cabal/bin:/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
14 - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
15 - travis_retry cabal update
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