constraints: any.Cabal ==2.4.0.1,
             any.HUnit ==1.6.0.0,
             any.IfElse ==0.85,
             any.QuickCheck ==2.12.6.1,
             QuickCheck +templatehaskell,
             any.alex ==3.2.4,
             alex +small_base,
             any.ansi-terminal ==0.9,
             ansi-terminal -example,
             any.array ==0.5.3.0,
             any.base ==4.12.0.0,
             any.binary ==0.8.6.0,
             any.bytestring ==0.10.8.2,
             any.cairo ==0.13.6.0,
             cairo +cairo_pdf +cairo_ps +cairo_svg,
             any.call-stack ==0.1.0,
             any.clock ==0.7.2,
             clock -llvm,
             any.colour ==2.3.4,
             any.containers ==0.6.0.1,
             any.deepseq ==1.4.4.0,
             any.directory ==1.3.3.0,
             any.erf ==2.0.0.0,
             any.exceptions ==0.10.0,
             any.filepath ==1.4.2.1,
             any.ghc-boot-th ==8.6.4,
             any.ghc-prim ==0.5.3,
             any.gio ==0.13.6.0,
             any.glib ==0.13.7.0,
             glib +closure_signals,
             any.gtk2hs-buildtools ==0.13.5.0,
             gtk2hs-buildtools +closuresignals,
             any.gtk3 ==0.15.1,
             gtk3 -build-demos +fmode-binary +have-gio,
             any.happy ==1.19.9,
             happy +small_base,
             any.hashable ==1.2.7.0,
             hashable -examples +integer-gmp +sse2 -sse41,
             any.hashtables ==1.2.3.1,
             hashtables -bounds-checking -debug -portable -sse42 +unsafe-tricks,
             any.hinotify-bytestring ==0.3.8.1,
             any.hpath ==0.9.2,
             any.hsc2hs ==0.68.4,
             hsc2hs -in-ghc-tree,
             any.hspec ==2.7.0,
             any.hspec-core ==2.7.0,
             any.hspec-discover ==2.7.0,
             any.hspec-expectations ==0.8.2,
             any.integer-gmp ==1.0.2.0,
             any.monad-loops ==0.4.3,
             monad-loops +base4,
             any.mtl ==2.2.2,
             any.network ==3.0.1.0,
             any.old-locale ==1.0.0.7,
             any.pango ==0.13.6.0,
             pango +new-exception,
             any.parsec ==3.1.13.0,
             any.pretty ==1.1.3.6,
             any.primitive ==0.6.4.0,
             any.process ==1.6.5.0,
             any.quickcheck-io ==0.2.0,
             any.random ==1.1,
             any.rts ==1.0,
             any.safe ==0.3.17,
             any.setenv ==0.1.1.3,
             any.simple-sendfile ==0.2.28,
             simple-sendfile +allow-bsd,
             any.stm ==2.5.0.0,
             any.template-haskell ==2.14.0.0,
             any.text ==1.2.3.1,
             any.tf-random ==0.5,
             any.time ==1.8.0.2,
             any.transformers ==0.5.6.2,
             any.transformers-compat ==0.6.2,
             transformers-compat -five +five-three -four +generic-deriving +mtl -three -two,
             any.unix ==2.7.2.2,
             any.unix-bytestring ==0.3.7.3,
             any.utf8-string ==1.0.1.1,
             any.vector ==0.12.0.2,
             vector +boundschecks -internalchecks -unsafechecks -wall,
             any.word8 ==0.1.3