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int-index / union

Extensible type-safe unions for Haskell
BSD 3-Clause "New" or "Revised" License
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Benchmark build failure: duplicate NFData instance for Proxy #4

Closed DanBurton closed 8 years ago

DanBurton commented 8 years ago 
/Users/danburton/scratch/union-0.1.1.0/bench/Benchmark.hs:11:10: error:
    Duplicate instance declarations:
      instance forall k (a :: k). NFData (Proxy a)
        -- Defined at bench/Benchmark.hs:11:10
      instance [safe] forall k (a :: k). NFData (Proxy a)
        -- Defined in ‘Control.DeepSeq’

How I reproduced the error:

stack unpack union-0.1.1.0
cd union-0.1.1.0
stack init --resolver nightly-2016-06-08
stack bench