error] 
[error]   Cannot resolve delambdafy target method $anonfun$assertion$1 at source-/home/runner/work/zio-prelude/zio-prelude/core-tests/shared/src/test/scala-2.12-2.13/zio/prelude/NewtypeSpecTypes212.scala,line-7,offset=161
[error]      while compiling: /home/runner/work/zio-prelude/zio-prelude/core-tests/shared/src/test/scala-2.12-2.13/zio/prelude/NewtypeSpecTypes212.scala
[error]         during phase: jscode
[error]      library version: version 2.13.16
[error]     compiler version: version 2.13.16

[error] 
[error]   last tree to typer: TypeTree(class List)
[error]        tree position: line 361 of /home/runner/work/zio-prelude/zio-prelude/core-tests/shared/src/test/scala/zio/prelude/ForEachSpec.scala
[error]             tree tpe: List
[error]               symbol: (sealed abstract) class List in package immutable
[error]    symbol definition: sealed abstract class List extends AbstractSeq with LinearSeq with LinearSeqOps with StrictOptimizedLinearSeqOps with StrictOptimizedSeqOps with IterableFactoryDefaults with DefaultSerializable (a ClassSymbol)
[error]       symbol package: scala.collection.immutable
[error]        symbol owners: class List
[error]            call site: <$anon: Function1> in package fx in package fx
[error] 
[error] == Source file context for tree position ==
[error] 
[error]    358           val actual   = values.foldMapM(errorOnOddNumber)
[error]    359 
[error]    360           assert(actual)(equalTo(expected)) &&
[error]    3[61](https://github.com/zio/zio-prelude/actions/runs/13171977585/job/36763853813#step:6:62)           assert(calledOn)(equalTo(List(3, 2)))
[error]    3[62](https://github.com/zio/zio-prelude/actions/runs/13171977585/job/36763853813#step:6:63)         }
[error]    3[63](https://github.com/zio/zio-prelude/actions/runs/13171977585/job/36763853813#step:6:64)       )
[error]    364     )
[error] Error while emitting NewtypeSpecTypes212.scala
[error] 
[error]   Cannot resolve delambdafy target method $anonfun$assertion$1 at source-/home/runner/work/zio-prelude/zio-prelude/core-tests/shared/src/test/scala-2.12-2.13/zio/prelude/NewtypeSpecTypes212.scala,line-7,offset=161
[error]      while compiling: /home/runner/work/zio-prelude/zio-prelude/core-tests/shared/src/test/scala-2.12-2.13/zio/prelude/NewtypeSpecTypes212.scala
[error]         during phase: jscode
[error]      library version: version 2.13.16
[error]     compiler version: version 2.13.16

package zio.prelude

// scalafix:off
object NewtypeSpecTypes212 {

  object Palindrome extends Newtype[String] {
    override def assertion = assertCustom { str =>
      if (str.reverse == str) Right(()) else Left(AssertionError.Failure("isPalindrome"))
    }
  }

  Palindrome("racecar")
}
// scalafix:on

        test("shortcircuits sideffects according to effect") {
          var calledOn: List[Int] = Nil

          def errorOnOddNumber(i: Int): Either[Int, Sum[Int]] = {
            calledOn = i :: calledOn

            if (i % 2 == 0) Right(Sum(i))
            else Left(i)
          }

          val values   = List(2, 3, 4)
          val expected = Left(3)
          val actual   = values.foldMapM(errorOnOddNumber)

          assert(actual)(equalTo(expected)) &&
          assert(calledOn)(equalTo(List(3, 2)))
        }