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Combine cases of Tuple.Zip disjoint from (h1 *: t1, h2 *: t2) #21287

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Nov 18, 2024
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Combine cases of Tuple.Zip disjoint from (h1 *: t1, h2 *: t2) #21287

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995d63b
Combine cases of `Tuple.Zip` disjoint from `(h1 *: t1, h2 *: t2)`
EugeneFlesselle Jul 30, 2024
14bf406
Test reduction of Tuple.Zip
EugeneFlesselle Nov 12, 2024
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9 changes: 3 additions & 6 deletions library/src/scala/Tuple.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -175,15 +175,12 @@ object Tuple {
}

/** Given two tuples, `A1 *: ... *: An * At` and `B1 *: ... *: Bn *: Bt`
* where at least one of `At` or `Bt` is `EmptyTuple` or `Tuple`,
* returns the tuple type `(A1, B1) *: ... *: (An, Bn) *: Ct`
* where `Ct` is `EmptyTuple` if `At` or `Bt` is `EmptyTuple`, otherwise `Ct` is `Tuple`.
* where at least one of `At` or `Bt` is `EmptyTuple`,
* returns the tuple type `(A1, B1) *: ... *: (An, Bn) *: EmptyTuple`.
*/
type Zip[T1 <: Tuple, T2 <: Tuple] <: Tuple = (T1, T2) match {
case (h1 *: t1, h2 *: t2) => (h1, h2) *: Zip[t1, t2]
case (EmptyTuple, _) => EmptyTuple
case (_, EmptyTuple) => EmptyTuple
case _ => Tuple
case _ => EmptyTuple
}

/** Converts a tuple `(F[T1], ..., F[Tn])` to `(T1, ... Tn)` */
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20 changes: 20 additions & 0 deletions tests/pos/tuple-zip.scala
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@@ -0,0 +1,20 @@

import scala.Tuple.Zip

type A
type B
type C

def Test =

summon[Zip[A *: B *: C *: EmptyTuple, C *: B *: A *: EmptyTuple] =:= (A, C) *: (B, B) *: (C, A) *: EmptyTuple]

summon[Zip[A *: B *: EmptyTuple, C *: B *: A *: EmptyTuple] =:= (A, C) *: (B, B) *: EmptyTuple]
summon[Zip[A *: B *: C *: EmptyTuple, C *: B *: EmptyTuple] =:= (A, C) *: (B, B) *: EmptyTuple]

summon[Zip[A *: B *: C *: Tuple, C *: B *: A *: Tuple] =:= (A, C) *: (B, B) *: (C, A) *: Zip[Tuple, Tuple]]
summon[Zip[A *: B *: C *: Tuple, C *: B *: A *: Tuple] <:< (A, C) *: (B, B) *: (C, A) *: Tuple]

summon[Zip[A *: B *: Tuple, C *: B *: A *: Tuple] =:= (A, C) *: (B, B) *: Zip[Tuple, A *: Tuple]]
summon[Zip[A *: B *: NonEmptyTuple, C *: B *: A *: Tuple] =:= (A, C) *: (B, B) *: Zip[NonEmptyTuple, A *: Tuple]]
summon[Zip[A *: B *: EmptyTuple, C *: B *: A *: Tuple] =:= (A, C) *: (B, B) *: EmptyTuple]
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