Create cabal project

Main.hs

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+module Main (main) where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

Setup.hs

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+import Distribution.Simple
+main = defaultMain

gloss-tryout.cabal

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+cabal-version:       >=1.10
+
+name:                gloss-tryout
+version:             0.1.0
+license:             ISC
+license-file:        LICENSE
+author:              Camden Dixie O'Brien
+maintainer:          cdo@wip.sh
+build-type:          Simple
+
+executable gloss-tryout
+  main-is:             Main.hs
+  build-depends:       base, gloss
+  default-language:    Haskell2010