Document GHC 91999 and GHC 86639 #507
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Bodigrim
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Feb 2, 2025
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| There is more info on deriving instances for extra typeclasses in the [GHC user | ||
| manual](https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_extra.html). |
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GitLab links can change, better to link documentation of a stable GHC release:
Suggested change
| There is more info on deriving instances for extra typeclasses in the [GHC user | |
| manual](https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/deriving_extra.html). | |
| There is more info on deriving instances for extra typeclasses in the [GHC user manual](https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/exts/deriving_extra.html). |
Bodigrim
reviewed
Feb 2, 2025
| `DerivingFunctor` language extension must be turned on. This can be done with a | ||
| pragma at the top of the file, or in build settings. | ||
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| The `DerivingFunctor` extension is turned on automatically from Haskell2021 |
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Suggested change
| The `DerivingFunctor` extension is turned on automatically from Haskell2021 | |
| The `DerivingFunctor` extension is turned on automatically from GHC2021 |
Bodigrim
reviewed
Feb 2, 2025
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| When deriving a `Functor` instance for a datatype in Haskell2010, the | ||
| `DerivingFunctor` language extension must be turned on. This can be done with a | ||
| pragma at the top of the file, or in build settings. |
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It might be worth mentioning that DeriveTraversable implies DeriveFunctor and also fixes the error.
Bodigrim
reviewed
Feb 2, 2025
| Any datatype that is exported from an .hs-boot file must be exported from the | ||
| corresponding .hs file. | ||
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| More information on .hs-boot modules is available in [the GHC user manual](https://downloads.haskell.org/ghc/latest/docs/users_guide/separate_compilation.html#how-to-compile-mutually-recursive-modules). |
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The anchor is gone, I guess it's now
Suggested change
| More information on .hs-boot modules is available in [the GHC user manual](https://downloads.haskell.org/ghc/latest/docs/users_guide/separate_compilation.html#how-to-compile-mutually-recursive-modules). | |
| More information on .hs-boot modules is available in [the GHC user manual](https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/separate_compilation.html#mutually-recursive-modules-and-hs-boot-files). |
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Got two tickets at the workshop, wrote some quick docs - if there's anything that needs changing, please feel free to request.