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Free.foldMap throws a java.lang.ClassCastException #712

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franciscodr opened this issue Dec 3, 2015 · 2 comments
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Free.foldMap throws a java.lang.ClassCastException #712

franciscodr opened this issue Dec 3, 2015 · 2 comments
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@ceedubs

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@franciscodr
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As commented in a Gitter conversation, when I try to transform a free monad to another monad like Option, List or Future using foldMap, I get a java.lang.ClassCastException.

I'm using cats 0.4.0-SNAPSHOT
@xuwei-k xuwei-k mentioned this issue Dec 4, 2015
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@ceedubs
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ceedubs commented Dec 4, 2015

Thanks for reporting, @franciscodr! I'll start to take a look at this.

@ceedubs ceedubs self-assigned this Dec 4, 2015
ceedubs added a commit to ceedubs/cats that referenced this issue Dec 4, 2015
@ceedubs
Revert Free.foldMap regression
c587300 
This reverts most of the changes from typelevel#702, because it appears to have
caused a regression in the case of Gosub. This commit fixes the
"mapSuspension id" unit test and the issue reported in typelevel#712.

The stack safety test is now failing. I've commented it out for now,
because an incorrectness bug seems to be worse than a stack safety
issue.
@ceedubs ceedubs mentioned this issue Dec 4, 2015
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@ceedubs After merging https://github.com/non/cats/pull/713, the example code works fine again. Thanks!

@ceedubs ceedubs closed this as completed Dec 9, 2015
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