Cabal 1.18 complains about PatternSynonyms.

Author: svenpanne

.travis.yml

@@ -76,7 +76,7 @@ script:
  - cabal configure --enable-tests --enable-benchmarks --ghc-options=-Werror -v2  # -v2 provides useful information for debugging
  - cabal build   # this builds all libraries and executables (including tests/benchmarks)
  - cabal test
- - cabal check
+ - if [ $CABALVER \> 1.18 ]; then cabal check; fi # Cabal 1.18 complains about PatternSynonyms
  - cabal haddock # tests that documentation can be generated
  - cabal sdist   # tests that a source-distribution can be generated