I mean, sure.

Setup.hs

@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain

app/Main.hs

@@ -0,0 +1,6 @@
+module Main where
+
+import Lib
+
+main :: IO ()
+main = someFunc

semantic-diff.cabal

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+name:                semantic-diff
+version:             0.1.0.0
+synopsis:            Initial project template from stack
+description:         Please see README.md
+homepage:            http://github.com/github/semantic-diff#readme
+author:              Rob Rix, Josh Vera
+maintainer:          robrix@github.com
+copyright:           2015 GitHub
+category:            Web
+build-type:          Simple
+-- extra-source-files:
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:      src
+  exposed-modules:     Lib
+  build-depends:       base >= 4.7 && < 5
+  default-language:    Haskell2010
+
+executable semantic-diff-exe
+  hs-source-dirs:      app
+  main-is:             Main.hs
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  build-depends:       base
+                     , semantic-diff
+  default-language:    Haskell2010
+
+test-suite semantic-diff-test
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      test
+  main-is:             Spec.hs
+  build-depends:       base
+                     , semantic-diff
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  default-language:    Haskell2010
+
+source-repository head
+  type:     git
+  location: https://github.com/githubuser/semantic-diff

src/Lib.hs

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+module Lib
+    ( someFunc
+    ) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"

test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"