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added a default id for Arrow #2072

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merged 6 commits into from
Dec 6, 2017
Merged

added a default id for Arrow #2072

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db35313
added a default id for Arrow
kailuowang Dec 6, 2017
7baba51
fix function
kailuowang Dec 6, 2017
d3ac25c
fix Kleisli instance and Cokleisli instance
kailuowang Dec 6, 2017
5899912
added mima exception
kailuowang Dec 6, 2017
5c75915
added more mima exception
kailuowang Dec 6, 2017
3ff449f
remove whitespace
kailuowang Dec 6, 2017
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remove whitespace
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@kailuowang
kailuowang committed Dec 6, 2017
commit 3ff449fd5587942365bb387b00d8fa0b92caa4e1
4 changes: 2 additions & 2 deletions core/src/main/scala/cats/arrow/Arrow.scala
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Expand Up @@ -15,9 +15,9 @@ import simulacrum.typeclass
* library `Control.Arrow`, this function is called `arr`.
*/
def lift[A, B](f: A => B): F[A, B]

override def id[A]: F[A, A] = lift(identity)

override def dimap[A, B, C, D](fab: F[A, B])(f: C => A)(g: B => D): F[C, D] =
compose(lift(g), andThen(lift(f), fab))

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