Replace EmptyTuple implementation from Unit to Tuple0

Author: nicolasstucki

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Apply.scala

@@ -13,7 +13,7 @@ class Apply {
   def setup(): Unit = {
     val size = sizeAndIndex.split(' ')(0).toInt
     index = sizeAndIndex.split(' ')(1).toInt
-    tuple = "elem" *: ()
+    tuple = "elem" *: Tuple()
 
     for (i <- 1 until size)
       tuple = "elem" *: tuple

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Concat.scala

@@ -11,7 +11,7 @@ class Concat {
   var tuple2: Tuple = _
 
   def tupleOfSize(n: Int): Tuple = {
-    var t: Tuple = ()
+    var t: Tuple = Tuple()
     for (i <- 1 to n)
       t = "elem" *: t
     t

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Cons.scala

@@ -12,7 +12,7 @@ class Cons {
 
   @Setup
   def setup(): Unit = {
-    tuple = ()
+    tuple = Tuple()
 
     for (i <- 1 to size)
       tuple = "elem" *: tuple

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Conversions.scala

@@ -12,7 +12,7 @@ class Conversions {
 
   @Setup
   def setup(): Unit = {
-    tuple = ()
+    tuple = Tuple()
 
     for (i <- 1 to size)
       tuple = "elem" *: tuple

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Map.scala

@@ -11,7 +11,7 @@ class Map {
 
   @Setup
   def setup(): Unit = {
-    tuple = ()
+    tuple = Tuple()
 
     for (i <- 1 to size)
       tuple = "elem" *: tuple

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Tail.scala

@@ -11,7 +11,7 @@ class Tail {
 
   @Setup
   def setup(): Unit = {
-    tuple = "elem" *: ()
+    tuple = "elem" *: Tuple()
 
     for (i <- 1 until size)
       tuple = "elem" *: tuple

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/TupleOps.scala

@@ -11,11 +11,11 @@ class TupleOps {
 
   @Setup
   def setup(): Unit = {
-    tuple1 = ()
+    tuple1 = Tuple()
     for (i <- 1 until 15)
       tuple1 = s"elem$i" *: tuple1
 
-    tuple2 = ()
+    tuple2 = Tuple()
     for (i <- 1 until 10)
       tuple2 = s"elem$i" *: tuple2
 
@@ -25,23 +25,23 @@ class TupleOps {
 
   def tupleFlatMap(tuple: Tuple, f: [A] => A => Tuple): Tuple = {
     def tailRecFlatMap(t: Tuple, acc: Tuple): Tuple = t match {
-      case () => acc
+      case Tuple() => acc
       case x *: rest => tailRecFlatMap(rest, acc ++ f(x))
     }
-    tailRecFlatMap(tuple, ())
+    tailRecFlatMap(tuple, Tuple())
   }
 
   def tupleReverse(tuple: Tuple): Tuple = {
     def tailRecReverse(t: Tuple, acc: Tuple): Tuple = t match {
-      case () => acc
+      case Tuple() => acc
       case x *: rest => tailRecReverse(rest, x *: acc)
     }
-    tailRecReverse(tuple, ())
+    tailRecReverse(tuple, Tuple())
   }
 
   def tupleMerge(tuple1: Tuple, tuple2: Tuple): Tuple = (tuple1, tuple2) match {
-    case (_, ()) => tuple1
-    case ((), _) => tuple2
+    case (_, Tuple()) => tuple1
+    case (Tuple(), _) => tuple2
     case (x *: xs, y *: ys) =>
       if (x.asInstanceOf[Int] <= y.asInstanceOf[Int]) x *: tupleMerge(xs, tuple2)
       else y *: tupleMerge(tuple1, ys)

bench-run/src/main/scala/dotty/tools/benchmarks/tuples/Zip.scala

@@ -13,8 +13,8 @@ class Zip {
 
   @Setup
   def setup(): Unit = {
-    tuple1 = ()
-    tuple2 = ()
+    tuple1 = Tuple()
+    tuple2 = Tuple()
 
     for (i <- 1 to size) {
       tuple1 = "el" *: tuple1

bench-run/src/main/scala/tuples/Drop.scala

@@ -12,7 +12,7 @@ class Drop {
 
   @Setup
   def setup(): Unit = {
-    tuple = ()
+    tuple = Tuple()
     half = size / 2
 
     for (i <- 1 to size)

bench-run/src/main/scala/tuples/Split.scala

@@ -12,7 +12,7 @@ class Split {
 
   @Setup
   def setup(): Unit = {
-    tuple = ()
+    tuple = Tuple()
     half = size / 2
 
     for (i <- 1 to size)