Test integerSimple on CI
Test integerSimple on CI

See #179

snowleopard/hadrian,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,bgamari/shaking-up-ghc,snowleopard/shaking-up-ghc,sdiehl/ghc,sdiehl/ghc,izgzhen/hadrian,sdiehl/ghc