[ghc-steering-committee] A plea against "fancy types" in GHC2021

Richard Eisenberg rae at richarde.dev
Tue Dec 8 19:57:22 UTC 2020

I agree with this. Fancy types are, well, fancy, and users should have to boldly declare that they're trying to be fancy.


> On Dec 8, 2020, at 11:46 AM, Iavor Diatchki <iavor.diatchki at gmail.com> wrote:
> Hello,
> I would like to advocate that things like `DataKinds`, `TypeFamilies`, and `GADTs` are not enabled by default in GHC2021.     The reason I ask for this is that unlike many others, I think these extensions convey useful information about the mindset you should use when working with a specific code base, which is quite different from working with ordinary Haskell.
> I do think it would be quite reasonable to have an umbrella extensions for FancyTypes too, which would enable all of those, I just don't think they should be enabled for every Haskell program.
> -Iavor
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