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MonadTrans instance for RWST and make MonadTrans serializable #1680

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merged 2 commits into from
May 18, 2017
Merged

MonadTrans instance for RWST and make MonadTrans serializable #1680

merged 2 commits into from
May 18, 2017

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wedens
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@wedens wedens commented May 18, 2017

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@wedens wedens mentioned this pull request May 18, 2017
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ceedubs
ceedubs reviewed May 18, 2017
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tests/src/test/scala/cats/tests/ReaderWriterStateTTests.scala Outdated
@@ -344,6 +344,13 @@ class ReaderWriterStateTTests extends CatsSuite {
checkAll("ReaderWriterStateT[ListWrapper, String, Int, String, Int]",
SemigroupKTests[ReaderWriterStateT[ListWrapper, String, Int, String, ?]].semigroupK[Int])
}

{
implicit def F = ListWrapper.monad
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Minor: I think that this could be a val instead of a def.

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copy/pasted it from some code above, so it's not the only place where it should be fixed :)

ceedubs
ceedubs reviewed May 18, 2017
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tests/src/test/scala/cats/tests/StateTTests.scala
@@ -235,7 +235,7 @@ class StateTTests extends CatsSuite {

checkAll("StateT[ListWrapper, Int, Int]", MonadTests[StateT[ListWrapper, Int, ?]].monad[Int, Int, Int])
checkAll("Monad[StateT[ListWrapper, Int, ?]]", SerializableTests.serializable(Monad[StateT[ListWrapper, Int, ?]]))
checkAll("MonadTrans[EitherT[?[_], String, ?]]", MonadTransTests[EitherT[?[_], String, ?]].monadTrans[ListWrapper, Int, Int])
checkAll("MonadTrans[StateT[?[_], Int, ?]]", MonadTransTests[StateT[?[_], String, ?]].monadTrans[ListWrapper, Int, Int])
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Oops good catch!

ceedubs
ceedubs reviewed May 18, 2017
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tests/src/test/scala/cats/tests/ReaderWriterStateTTests.scala Outdated
@@ -344,6 +344,13 @@ class ReaderWriterStateTTests extends CatsSuite {
checkAll("ReaderWriterStateT[ListWrapper, String, Int, String, Int]",
SemigroupKTests[ReaderWriterStateT[ListWrapper, String, Int, String, ?]].semigroupK[Int])
}

{
implicit def F = ListWrapper.monad
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Should we be checking the serialization laws here too?

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ceedubs commented May 18, 2017

Wow that was fast. Thanks @wedens!

kailuowang
kailuowang approved these changes May 18, 2017
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👍 modular the minor comment @ceedubs made

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wedens commented May 18, 2017

fixed

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wedens commented May 18, 2017

I'm not sure how to fix the build. Fails only on non-js 2.12.2

[info] - MonadTrans[ReaderWriterStateT[?[_], String, Int, String, ?]].serializable.can serialize and deserialize *** FAILED *** (45 milliseconds)
[info]   NotSerializableException was thrown during property evaluation.
[info]     Message: cats.data.RWSTInstances$$anon$12
[info]     Occurred when passed generated values (
[info]   
[info]     )

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ceedubs commented May 18, 2017

Oh @wedens I think that we probably want the MonadTrans trait to extend Any with Serializable. I think that this is being done automatically for our type classes that use simulacrum. See Semigroup for an example of a type class that isn't using simulacrum.

@wedens wedens changed the title MonadTrans instance for RWST MonadTrans instance for RWST and make MonadTrans serializable May 18, 2017
peterneyens
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Thanks for the quick fix, @wedens

@peterneyens peterneyens merged commit 6ad7d8f into typelevel:master May 18, 2017
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Codecov Report

❗ No coverage uploaded for pull request base (master@b4995b2). Click here to learn what that means.
The diff coverage is 100%.

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@@            Coverage Diff            @@
##             master    #1680   +/-   ##
=========================================
  Coverage          ?   93.42%           
=========================================
  Files             ?      242           
  Lines             ?     4075           
  Branches          ?      140           
=========================================
  Hits              ?     3807           
  Misses            ?      268           
  Partials          ?        0
Impacted Files Coverage Δ
.../src/main/scala/cats/data/ReaderWriterStateT.scala 96% <100%> (ø)

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@wedens wedens deleted the rwst_monad_trans branch May 18, 2017 16:54
@kailuowang kailuowang modified the milestone: 1.0.0-MF May 18, 2017
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