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Added CommutativeMonoid for Option to scope #3463

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Jun 11, 2020
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Added CommutativeMonoid for Option to scope #3463

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1d93305
Added CommutativeMonoid for Option to scope
barambani Jun 10, 2020
27741bd
Fix ambiguity when the base type has both Semigroup and CommutativeSe…
barambani Jun 10, 2020
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1 change: 0 additions & 1 deletion kernel-laws/shared/src/test/scala/cats/kernel/laws/LawTests.scala
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
package cats.kernel
package laws

import cats.kernel.instances.all._
import cats.kernel.laws.discipline._
import cats.platform.Platform

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5 changes: 4 additions & 1 deletion kernel/src/main/scala/cats/kernel/Semigroup.scala
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Expand Up @@ -267,7 +267,10 @@ private[kernel] trait SemigroupInstances {
cats.kernel.instances.function.catsKernelSemigroupForFunction1[A, B]
implicit def catsKernelSemigroupForEither[A, B: Semigroup]: Semigroup[Either[A, B]] =
cats.kernel.instances.either.catsDataSemigroupForEither[A, B]
implicit def catsKernelSemigroupForTry[A: Semigroup]: Semigroup[Try[A]] = new TrySemigroup[A](Semigroup[A])
implicit def catsKernelSemigroupForTry[A: Semigroup]: Semigroup[Try[A]] =
new TrySemigroup[A](Semigroup[A])
implicit def catsKernelCommutativeMonoidForOption[A: CommutativeSemigroup]: CommutativeMonoid[Option[A]] =
cats.kernel.instances.option.catsKernelStdCommutativeMonoidForOption[A]
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I take it this was simply missed in @travisbrown's conversion of all these instances? If so, then I'm 👍 on this addition.

}

private class TryMonoid[A](A: Monoid[A]) extends TrySemigroup[A](A) with Monoid[Try[A]] {
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