Bug#867876: haskell-http-api-data FTBFS: Duplicate instance declarations

[Adrian Bunk]

Source: haskell-http-api-data
Version: 0.2.4-5
Severity: serious
Tags: buster sid

I can also reproduce this FTBFS on amd64:

https://buildd.debian.org/status/fetch.php?pkg=haskell-http-api-data&arch=mips64el&ver=0.2.4-5%2Bb1&stamp=1499675774&raw=0

...
[1 of 1] Compiling Main             ( test/Spec.hs, dist-ghc/build/spec/spec-tmp/Main.o )

test/Spec.hs:50:10: error:
    Duplicate instance declarations:
      instance Arbitrary Version -- Defined at test/Spec.hs:50:10
      instance [safe] Arbitrary Version
        -- Defined in `Test.QuickCheck.Arbitrary'
/usr/share/cdbs/1/class/hlibrary.mk:147: recipe for target 'build-ghc-stamp' failed
make: *** [build-ghc-stamp] Error 1