Hi everyone,

I don't think it's obvious why these type need to be in the base package itself. It makes sense that the GHC.Generics types are in base because GHC needs access to them to derive Generic. We already have Proxy in base. The trivia package was released in 2014 but no other package has needed that functionality enough to depend on it. What problem is being solved?

I think the types provided by packages like transformers are more important to general Haskell programming, and I'm quite happy to have those types in a separate package.

Best regards,

Eric Mertens

On Tue, Jan 24, 2017 at 11:18 AM Baldur Blöndal <baldurpet@gmail.com> wrote:

Deadline of 2 weeks.

Original discussion: ⁽¹⁾

data Zero a
data One a = One

Same definitions as in ‘trivia’ package,⁽²⁾
if a consensus is reached we can update
the documentation for Free:⁽³⁾

“Free Zero” is isomorphic to Identity.
“Free One” is isomorphic to Maybe.

⁽¹⁾ https://ghc.haskell.org/trac/ghc/ticket/13177
⁽²⁾ https://hackage.haskell.org/package/trivia
⁽³⁾ https://hackage.haskell.org/package/free-4.12.4/docs/Control-Monad-Free.html
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