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Document why monad transformers don't have Applicative instances. #2272

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kailuowang opened this issue May 30, 2018 · 1 comment
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Document why monad transformers don't have Applicative instances. #2272

kailuowang opened this issue May 30, 2018 · 1 comment
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@kailuowang
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see #2181 (comment)
Probably in the FAQ section, maybe also mention in the guideline.
@kailuowang kailuowang mentioned this issue May 30, 2018
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@kubukoz
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kubukoz commented May 30, 2018 •
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I could implement this sometime this week if it's OK.

Worth noting (from gitter: https://gitter.im/typelevel/cats?at=5b0ed363361a950a6629f2a4)

Jakub Kozłowski @kubukoz 18:37
#2272 - is this correct? I see a MonadError for EitherT, which implies Applicative
I'm probably missing something obvious

LukaJCB @LukaJCB 18:39
Right, of course they do have an Applicative, just that Applicative[F] doesn’t give them an Applicative :)

Edit: mention using .nested instead

@kubukoz kubukoz mentioned this issue Jun 3, 2018
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