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Add regression test for #23616 #23623

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Merged
merged 1 commit into from
Jul 29, 2025
Merged

Add regression test for #23616 #23623

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22 changes: 22 additions & 0 deletions tests/pos/i23616.scala
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Original file line number Diff line number Diff line change
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trait Apply[F[_]]:
extension [A](fa: F[A])
def map[B](f: A => B): F[B]
def map2[B, Z](fb: F[B])(f: (A, B) => Z): F[Z] = ???

private case class IsMap[T <: Tuple](value: Tuple.Map[T, F])
private inline def tupledGeneric[T <: Tuple](tuple: Tuple.Map[T, F]): F[T] =
inline IsMap(tuple) match
case t: IsMap[h *: EmptyTuple] => t.value.head.map(_ *: EmptyTuple)
case t: IsMap[h *: t] =>
val head = t.value.head
val tail = tupledGeneric(t.value.tail)
head.map2(tail)(_ *: _)

trait Monad[F[_]] extends Apply[F]:
extension [A](fa: F[A]) def flatMap[B](f: A => F[B]): F[B]
extension [A](fa: F[A]) override def map[B](f: A => B): F[B] = ???

opaque type Kleisli[F[_], A, B] = A => F[B]
given [F[_], A](using F: Monad[F]): Monad[[B] =>> Kleisli[F, A, B]] with
extension [B](k: Kleisli[F, A, B])
def flatMap[C](f: B => Kleisli[F, A, C]) = ???
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