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Fix #13633: Add regression test #13635

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Jan 13, 2022
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Fix #13633: Add regression test #13635

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50 changes: 50 additions & 0 deletions tests/pos/13633.scala
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Original file line number Diff line number Diff line change
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import scala.compiletime.{constValueTuple, constValue}

object Sums extends App:

println(constValueTuple[Plus[(true, true, true), (true, true)]]) // works
println(constValueTuple[Plus1[(true, true, true), (true, true)]]) // fails
println(constValueTuple[
Reverse[PlusLoop[Reverse[(true, true, true)], Reverse[(true, true)], false]]]
) // also works despite it's just an unfold of `Plus1` application

type Plus[A <: Tuple, B <: Tuple] <: Tuple = (A, B) match
case (EmptyTuple, EmptyTuple) => EmptyTuple
case (a, b) => Reverse[PlusLoop[Reverse[A], Reverse[B], false]]

type Plus1[A <: Tuple, B <: Tuple] = Reverse[PlusLoop[Reverse[A], Reverse[B], false]]

type ReverseLoop[A, XS <: Tuple] <: Tuple = A match {
case EmptyTuple => XS
case x *: xs => ReverseLoop[xs, x *: XS]
}

type Reverse[A] = ReverseLoop[A, EmptyTuple]

type PlusTri[A, B, C] = (A, B, C) match
case (false, false, false) => (false, false)
case (true, false, false) | (false, true, false) | (false, false, true) => (false, true)
case (true, true, false) | (true, false, true) | (false, true, true) => (true, false)
case (true, true, true) => (true, true)

type Inc[A <: Tuple] <: Tuple = A match
case EmptyTuple => true *: EmptyTuple
case t *: as =>
t match
case false => true *: as
case true => false *: Inc[as]

type IncT[A <: Tuple, O <: Boolean] <: Tuple = O match
case false => A
case true => Inc[A]

type PlusLoop[A <: Tuple, B <: Tuple, O] <: Tuple = (A, B) match
case (EmptyTuple, EmptyTuple) =>
O match
case true => (true *: EmptyTuple)
case false => EmptyTuple
case (EmptyTuple, B) => IncT[B, O]
case (A, EmptyTuple) => IncT[A, O]
case (a *: as, b *: bs) =>
PlusTri[a, b, O] match
case (x, y) => y *: PlusLoop[as, bs, x]