No Bifoldable for cats.data.ValidatedNec
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Description
@ (v: List[ValidatedNec[Error, Any]]).separate
cmd8.sc:1: Could not find an instance of Bifoldable for cats.data.ValidatedNec
val res8 = (v: List[ValidatedNec[Error, Any]]).separate
But it works for the unaliased type:
@ (v: List[Validated[NonEmptyChain[Error], Any]]).separate
res10: (List[NonEmptyChain[Error]], List[Any]) = (List(Singleton(a = Error(a = "a")), Append(leftNE = Singleton(a = Error(a = "b")), rightNE = Singleton(a = Error(a = "c")))), List())
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the two ValidatedNec and Validated[NonEmptyChain] snippets and compare the available Bifoldable instances for those types. Trace the typeclass lookup for the alias and verify that the alias supports separate with the same result as the unaliased type.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- scala
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100