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- [\#10487](https://gitlab.haskell.org//ghc/ghc/issues/10487): `Generic` name clash
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- [\#10514](https://gitlab.haskell.org//ghc/ghc/issues/10514): `Generic` for existentials
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- [\#9766](https://gitlab.haskell.org//ghc/ghc/issues/9766): use data type promotion to improve the implementation of generics
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- [\#9968](https://gitlab.haskell.org//ghc/ghc/issues/9968): panic with `DeriveAnyClass`
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## Impredicativity and higher rank
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## Performance (compile time or runtime)
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- [\#8095](https://gitlab.haskell.org//ghc/ghc/issues/8095): very slow constraint solving
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- [\#8095](https://gitlab.haskell.org//ghc/ghc/issues/8095): very slow constraint solving; perhaps discard large constraints using `UnivCo`
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- [\#5642](https://gitlab.haskell.org//ghc/ghc/issues/5642): slow constraint solving
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- [\#9979](https://gitlab.haskell.org//ghc/ghc/issues/9979), [\#8814](https://gitlab.haskell.org//ghc/ghc/issues/8814), [\#8835](https://gitlab.haskell.org//ghc/ghc/issues/8835): attoparsec regressed 7.8.4 to HEAD
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- [\#8852](https://gitlab.haskell.org//ghc/ghc/issues/8852), [\#8980](https://gitlab.haskell.org//ghc/ghc/issues/8980), [\#8941](https://gitlab.haskell.org//ghc/ghc/issues/8941) (possibly), [\#9803](https://gitlab.haskell.org//ghc/ghc/issues/9803), [\#8960](https://gitlab.haskell.org//ghc/ghc/issues/8960), [\#7898](https://gitlab.haskell.org//ghc/ghc/issues/7898), [\#7068](https://gitlab.haskell.org//ghc/ghc/issues/7068), [\#7944](https://gitlab.haskell.org//ghc/ghc/issues/7944), [\#5550](https://gitlab.haskell.org//ghc/ghc/issues/5550), [\#8836](https://gitlab.haskell.org//ghc/ghc/issues/8836): `SpecConstr` blowup
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