cabal-version: >=1.7.0

With cabal versions prior to 1.7.1 the build-depends of any executable stanzas
are included in the build depends which are registered with ghc-pkg. Cabal's
resolver therefore has a complete set of build-depends when it selects the
installed version of foo. `./test.sh` does not exhibit the bug described in
haskell/cabal#1896.

Author: benarmston

.gitignore

@@ -0,0 +1,7 @@
+.cabal-sandbox/
+.hpc/
+cabal.sandbox.config
+dist/
+tests.tix
+bar/freeze.after
+bar/freeze.before

bar/Setup.hs

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+import Distribution.Simple
+main = defaultMain

bar/bar.cabal

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+name: bar
+version: 0.0.0.1
+cabal-version: >=1.4
+build-type: Simple
+license: MIT
+
+library
+    build-depends:
+        base -any,
+        foo ==0.0.0.1
+

bar/test.sh

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+#!/bin/bash
+
+set -x
+set -e
+
+cabal sandbox delete
+cabal clean
+cabal sandbox init
+cabal sandbox add-source ../foo
+
+cabal freeze --dry-run > freeze.before
+
+cabal install --only-dependencies
+
+cabal freeze --dry-run > freeze.after
+
+diff -u freeze.before freeze.after

foo/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Ben Armston <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+

foo/Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "foo"

foo/README.md

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+# Cabal packages demonstrating cabal issue 1896
+
+This repository demonstrates the bug at https://github.com/haskell/cabal/issues/1896
+
+There are three tags of interest `cabal-1.7.0`, `cabal-1.7.1` and `no-lib`.
+The commit message for each along with the discussion on the above ticket
+explain what they are and what they do.
+
+The bug can be exercised by running `test.sh`. Note only `cabal-1.7.1` will
+exercise the bug.

foo/Setup.hs

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+import Distribution.Simple
+main = defaultMain

foo/foo.cabal

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+name: foo
+version: 0.0.0.1
+cabal-version: >=1.7.0
+build-type: Simple
+license: MIT
+synopsis: Has both libarary and executable stanzas both of which have dependencies.
+
+library
+    build-depends:
+        base >=4.4 && <5
+    hs-source-dirs: src
+
+executable foo
+    build-depends:
+        base >=4 && <5,
+        old-time >=1.0 && <1.2
+    main-is: Main.hs
+