Ah, thank you, I've seen it before but somehow couldn't find now. On Fri, Nov 6, 2015 at 11:08 AM, Ivan Lazar Miljenovic < ivan.miljenovic@gmail.com> wrote:

Did you mean this link for the Users Guide?

https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/deriving.htm...

DeriveAny class lets you write

...

data Foo = ... deriving (Bar)

instead of:

...

data Foo = ... instance Bar Foo

(i.e. if it's possible to make it an instance without having to provide explicit method implementations); as the Users Guide hints it's primarily useful in cases where default definitions are provided for you, typically using the DefaultSignatures definition with GHC.Generics.

On 6 November 2015 at 20:01, Kostiantyn Rybnikov wrote:

...

Is there a topic for DeriveAnyClass extension in user guide? It is mentioned several times in different places, also I see link to it in from cabal haddocs [0] into its page inside "other type extensions" [1], but it leads nowhere.

Thank you.

[0]:

https://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Language-Ha...

...

[1]:

https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/other-type-e...

...

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