Closed
Description
Compiler version
3.2.1
Minimized code
//> using scala "3.2.1"
import scala.compiletime.ops.int._
object TupleOps {
import Tuple._
type Reduce[T <: NonEmptyTuple, F[_, _]] =
Fold[Tuple.Tail[T], Tuple.Head[T], F]
type Maximum[T <: NonEmptyTuple] = Reduce[
T,
[A, B] =>> (A, B) match {
case (Int, Int) => A Max B
}
]
type IndexOfRec[T <: Tuple, Elem, I <: Int] = Tuple.Elem[T, I] match {
case Elem => I
case _ => IndexOfRec[T, Elem, I + 1]
}
type IndexOf[T <: Tuple, Elem] = IndexOfRec[T, Elem, 0]
type DropLargest[T <: NonEmptyTuple] =
T IndexOf Maximum[T] match {
case Int =>
(
(T Take (T IndexOf Maximum[T])) Concat
(T Drop ((T IndexOf Maximum[T]) + 1))
) *: EmptyTuple
}
type BubbleSort[T <: Tuple] = T match {
case EmptyTuple => EmptyTuple
case NonEmptyTuple =>
BubbleSort[DropLargest[T]] Concat (Maximum[T] *: EmptyTuple)
}
}
object demo extends App {
println(compiletime.constValue[TupleOps.BubbleSort[(1, 2)]])
}Output
Compiles forever. I'm able to get it to terminate with a recursion overflow if I specify really low stack, e.g. -Xss256K:
scala-cli compile . --bloop-java-opt -Xss256K
Starting compilation server
Compiling project (Scala 3.2.1, JVM)
dotty.tools.dotc.core.RecursionOverflow:
Error compiling project (Scala 3.2.1, JVM)
dotty.tools.dotc.core.RecursionOverflow:
Error: Unexpected error when compiling project_f0e8bc45bf: ''
Compilation failedExpectation
Successfully compiles or fails compilation in a couple seconds at most