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Merged
odersky merged 1 commit into from
May 31, 2021
Merged

Show root of stackoverflow in IsFullyDefinedAccumulator #12649

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17 changes: 17 additions & 0 deletions tests/neg/i12640.scala
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Original file line number Diff line number Diff line change
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package x

trait CpsMonad[F[_]]:
def pure[A](x:A): F[A]
def flatMap[A,B](fa:F[A])(f: A=>F[B]): F[B]

abstract sealed class CpsStream[-F[_],+T]

case class Cons[F[_],T](head:T, tailFun: ()=>F[CpsStream[F,T]]) extends CpsStream[F,T]

case class Empty[F[_]]() extends CpsStream[F,Nothing]

def unfold[S,F[_]:CpsMonad,T](s0:S)(f:S => F[Option[(S,T)]]):F[CpsStream[F,T]] =
summon[CpsMonad[F]].flatMap(f(s0)){
case Some(s1,a) => Cons(a, () => unfold(s1,f)) // error // error
case None => summon[CpsMonad[F]].pure(Empty[F]())
}