Example cabal package with incomplete other-modules section

Bar.hs

module Bar where

example.cabal

name:                example
version:             0.1.0.0
author:              Karl Voelker
maintainer:          karl@karlv.net
build-type:          Simple
cabal-version:       >=1.10

library
  exposed-modules:     Foo
  build-depends:       base >=4.8 && <4.9
  default-language:    Haskell2010

Foo.hs

module Foo where
import Bar

Setup.hs

import Distribution.Simple
main = defaultMain