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Closes #16463
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-- Error: tests/neg/16463.scala:42:33 ---------------------------------------------------------------------------------- | ||
42 | println(compiletime.constValue[TupleOps.BubbleSort[(1, 2)]]) // error: Recursion limit exceeded | ||
| ^ | ||
| Recursion limit exceeded. | ||
| Maybe there is an illegal cyclic reference? | ||
| If that's not the case, you could also try to increase the stacksize using the -Xss JVM option. | ||
| For the unprocessed stack trace, compile with -Yno-decode-stacktraces. | ||
| A recurring operation is (inner to outer): | ||
| | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| ... | ||
| | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type EmptyTuple *: EmptyTuple match ... | ||
| reduce type ((1 : Int) *: EmptyTuple.type) *: EmptyTuple match ... | ||
| reduce type ((1 : Int), (2 : Int)) match ... |
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//> using scala "3.2.1" | ||
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import scala.compiletime.ops.int._ | ||
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object TupleOps { | ||
import Tuple._ | ||
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type Reduce[T <: NonEmptyTuple, F[_, _]] = | ||
Fold[Tuple.Tail[T], Tuple.Head[T], F] | ||
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type Maximum[T <: NonEmptyTuple] = Reduce[ | ||
T, | ||
[A, B] =>> (A, B) match { | ||
case (Int, Int) => A `Max` B | ||
} | ||
] | ||
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type IndexOfRec[T <: Tuple, Elem, I <: Int] = Tuple.Elem[T, I] match { | ||
case Elem => I | ||
case _ => IndexOfRec[T, Elem, I + 1] | ||
} | ||
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type IndexOf[T <: Tuple, Elem] = IndexOfRec[T, Elem, 0] | ||
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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 | ||
} | ||
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type BubbleSort[T <: Tuple] = T match { | ||
case EmptyTuple => EmptyTuple | ||
case NonEmptyTuple => | ||
BubbleSort[DropLargest[T]] `Concat` (Maximum[T] *: EmptyTuple) | ||
} | ||
} | ||
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object demo extends App { | ||
println(compiletime.constValue[TupleOps.BubbleSort[(1, 2)]]) // error: Recursion limit exceeded | ||
} |