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-}instanceF a =>C[[a]]
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```
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### DPH is gone
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Data Parallel Haskell and GHC's automatic vectorization support, which have been bitrotting for many years, have finally been removed. One particularly user-facing change related to this is that the `-Odph` flag is now gone, so GHC will simply error if it is passed `-Odph` as a flag. (Note that `-Odph` was simply a synonym for `-O2 -fmax-simplifier-iterations=20 -fsimplifier-phases=3`.)
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---
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## Library changes
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