Please describe the problem.

I am getting build errors when trying to compile git-annex with QuickCheck 2.8.2.

What steps will reproduce the problem?

Build git-annex with QuickCheck 2.8.2, and get the following errors:

[ 30 of 535] Compiling Utility.QuickCheck ( Utility/QuickCheck.hs, dist/build/git-annex/git-annex-tmp/Utility/QuickCheck.o )

    Duplicate instance declarations:
      instance (Arbitrary k, Arbitrary v, Eq k, Ord k) =>
               Arbitrary (M.Map k v)
        -- Defined at Utility/QuickCheck.hs:24:10
      instance [safe] (Ord k, Arbitrary k, Arbitrary v) =>
                      Arbitrary (M.Map k v)
        -- Defined in `Test.QuickCheck.Arbitrary'

    Duplicate instance declarations:
      instance (Arbitrary v, Eq v, Ord v) => Arbitrary (S.Set v)
        -- Defined at Utility/QuickCheck.hs:27:10
      instance [safe] (Ord a, Arbitrary a) => Arbitrary (S.Set a)
        -- Defined in `Test.QuickCheck.Arbitrary'

What version of git-annex are you using? On what operating system?

git-annex 6.20160114, on Arch Linux x86_64.

Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Yes, it built fine with QuickCheck 2.8. I didn't test with 2.8.1, though.

ifdefed those instances out with this version of quickcheck. done --Joey