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+# from https://docs.haskellstack.org/en/stable/GUIDE/#travis-with-caching
+
+# Use new container infrastructure to enable caching
+sudo: false
+
+# Choose a lightweight base image; we provide our own build tools.
+language: c
+
+# Caching so the next build will be fast too.
+cache:
+  directories:
+  - $HOME/.ghc
+  - $HOME/.cabal
+  - $HOME/.stack
+
+# The different configurations we want to test. We have BUILD=cabal which uses
+# cabal-install, and BUILD=stack which uses Stack. More documentation on each
+# of those below.
+#
+# We set the compiler values here to tell Travis to use a different
+# cache file per set of arguments.
+#
+# If you need to have different apt packages for each combination in the
+# matrix, you can use a line such as:
+#     addons: {apt: {packages: [libfcgi-dev,libgmp-dev]}}
+matrix:
+  include:
+  # We grab the appropriate GHC and cabal-install versions from hvr's PPA. See:
+  # https://github.com/hvr/multi-ghc-travis
+  #- env: BUILD=cabal GHCVER=7.0.4 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.0.4"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.0.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.2.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.2.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.2.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.4.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  - env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+    compiler: ": #GHC 7.6.3"
+    addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  - env: BUILD=cabal GHCVER=7.8.4 CABALVER=1.18 HAPPYVER=1.19.5 ALEXVER=3.1.7
+    compiler: ": #GHC 7.8.4"
+    addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  - env: BUILD=cabal GHCVER=7.10.3 CABALVER=1.22 HAPPYVER=1.19.5 ALEXVER=3.1.7
+    compiler: ": #GHC 7.10.3"
+    addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  - env: BUILD=cabal GHCVER=8.0.1 CABALVER=1.24 HAPPYVER=1.19.5 ALEXVER=3.1.7
+    compiler: ": #GHC 8.0.1"
+    addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.1,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+  # Build with the newest GHC and cabal-install. This is an accepted failure,
+  # see below.
+  - env: BUILD=cabal GHCVER=head  CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+    compiler: ": #GHC HEAD"
+    addons: {apt: {packages: [cabal-install-head,ghc-head,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+  # # The Stack builds. We can pass in arbitrary Stack arguments via the ARGS
+  # # variable, such as using --stack-yaml to point to a different file.
+  # - env: BUILD=stack ARGS=""
+  #   compiler: ": #stack default"
+  #   addons: {apt: {packages: [ghc-7.10.3], sources: [hvr-ghc]}}
+
+  # - env: BUILD=stack ARGS="--resolver lts-2"
+  #   compiler: ": #stack 7.8.4"
+  #   addons: {apt: {packages: [ghc-7.8.4], sources: [hvr-ghc]}}
+
+  # - env: BUILD=stack ARGS="--resolver lts-3"
+  #   compiler: ": #stack 7.10.2"
+  #   addons: {apt: {packages: [ghc-7.10.2], sources: [hvr-ghc]}}
+
+  # - env: BUILD=stack ARGS="--resolver lts-6"
+  #   compiler: ": #stack 7.10.3"
+  #   addons: {apt: {packages: [ghc-7.10.3], sources: [hvr-ghc]}}
+
+  # # Nightly builds are allowed to fail
+  # - env: BUILD=stack ARGS="--resolver nightly"
+  #   compiler: ": #stack nightly"
+  #   addons: {apt: {packages: [libgmp,libgmp-dev]}}
+
+  # # Build on OS X in addition to Linux
+  # - env: BUILD=stack ARGS=""
+  #   compiler: ": #stack default osx"
+  #   os: osx
+
+  # - env: BUILD=stack ARGS="--resolver lts-2"
+  #   compiler: ": #stack 7.8.4 osx"
+  #   os: osx
+
+  # - env: BUILD=stack ARGS="--resolver lts-3"
+  #   compiler: ": #stack 7.10.2 osx"
+  #   os: osx
+
+  # - env: BUILD=stack ARGS="--resolver lts-6"
+  #   compiler: ": #stack 7.10.3 osx"
+  #   os: osx
+
+  # - env: BUILD=stack ARGS="--resolver nightly"
+  #   compiler: ": #stack nightly osx"
+  #   os: osx
+
+  allow_failures:
+  - env: BUILD=cabal GHCVER=head  CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+  # - env: BUILD=stack ARGS="--resolver nightly"
+
+before_install:
+# Using compiler above sets CC to an invalid value, so unset it
+- unset CC
+
+# We want to always allow newer versions of packages when building on GHC HEAD
+- CABALARGS=""
+- if [ "x$GHCVER" = "xhead" ]; then CABALARGS=--allow-newer; fi
+
+# Download and unpack the stack executable
+- export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.local/bin:/opt/alex/$ALEXVER/bin:/opt/happy/$HAPPYVER/bin:$HOME/.cabal/bin:$PATH
+- mkdir -p ~/.local/bin
+- |
+  if [ `uname` = "Darwin" ]
+  then
+    travis_retry curl --insecure -L https://www.stackage.org/stack/osx-x86_64 | tar xz --strip-components=1 --include '*/stack' -C ~/.local/bin
+  else
+    travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+  fi
+
+  # Use the more reliable S3 mirror of Hackage
+  mkdir -p $HOME/.cabal
+  echo 'remote-repo: hackage.haskell.org:http://hackage.fpcomplete.com/' > $HOME/.cabal/config
+  echo 'remote-repo-cache: $HOME/.cabal/packages' >> $HOME/.cabal/config
+
+  if [ "$CABALVER" != "1.16" ]
+  then
+    echo 'jobs: $ncpus' >> $HOME/.cabal/config
+  fi
+
+# Get the list of packages from the stack.yaml file
+- PACKAGES=$(stack --install-ghc query locals | grep '^ *path' | sed 's@^ *path:@@')
+
+install:
+- echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
+- if [ -f configure.ac ]; then autoreconf -i; fi
+- |
+  set -ex
+  case "$BUILD" in
+    stack)
+      stack --no-terminal --install-ghc $ARGS test --bench --only-dependencies
+      ;;
+    cabal)
+      cabal --version
+      travis_retry cabal update
+      cabal install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+      ;;
+  esac
+  set +ex
+
+script:
+- |
+  set -ex
+  case "$BUILD" in
+    stack)
+      stack --no-terminal $ARGS test --bench --no-run-benchmarks --haddock --no-haddock-deps
+      ;;
+    cabal)
+      cabal install --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+
+      ORIGDIR=$(pwd)
+      for dir in $PACKAGES
+      do
+        cd $dir
+        cabal check || [ "$CABALVER" == "1.16" ]
+        cabal sdist
+        PKGVER=$(cabal info . | awk '{print $2;exit}')
+        SRC_TGZ=$PKGVER.tar.gz
+        cd dist
+        tar zxfv "$SRC_TGZ"
+        cd "$PKGVER"
+        cabal configure --enable-tests
+        cabal build
+        cd $ORIGDIR
+      done
+      ;;
+  esac
+  set +ex