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Update wildcard types in Tuple match types #18815

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Update wildcard types in Tuple match types #18815

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12 changes: 6 additions & 6 deletions library/src/scala/Tuple.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -97,25 +97,25 @@ object Tuple {

/** Type of the head of a tuple */
type Head[X <: NonEmptyTuple] = X match {
case x *: _ => x
case x *: ? => x
}

/** Type of the initial part of the tuple without its last element */
type Init[X <: Tuple] <: Tuple = X match {
case _ *: EmptyTuple => EmptyTuple
case ? *: EmptyTuple => EmptyTuple
case x *: xs =>
x *: Init[xs]
}

/** Type of the tail of a tuple */
type Tail[X <: NonEmptyTuple] <: Tuple = X match {
case _ *: xs => xs
case ? *: xs => xs
}

/** Type of the last element of a tuple */
type Last[X <: Tuple] = X match {
case x *: EmptyTuple => x
case _ *: xs => Last[xs]
case ? *: xs => Last[xs]
}

/** Type of the concatenation of two tuples */
Expand Down Expand Up @@ -182,8 +182,8 @@ object Tuple {
*/
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 (EmptyTuple, ?) => EmptyTuple
case (?, EmptyTuple) => EmptyTuple
case _ => Tuple
}

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