Revert tuple labels.

Author: LemonSpike

Sources/Algorithms/Cycle.swift

@@ -110,7 +110,7 @@ extension FiniteCycle: Collection {
 
   @inlinable
   public subscript(_ index: Index) -> Element {
-    product[index.productIndex].element2
+    product[index.productIndex].1
   }
 
   @inlinable

Sources/Algorithms/Product.swift

@@ -44,8 +44,8 @@ extension Product2: Sequence {
     }
 
     @inlinable
-    public mutating func next() -> (element1: Base1.Element,
-                                    element2: Base2.Element)? {
+    public mutating func next() -> (Base1.Element,
+                                    Base2.Element)? {
       // This is the initial state, where i1.next() has never
       // been called, or the final state, where i1.next() has
       // already returned nil.
@@ -58,7 +58,7 @@ extension Product2: Sequence {
       // Get the next element from the second sequence, if not
       // at end.
       if let element2 = i2.next() {
-        return (element1: element1!, element2: element2)
+        return (element1!, element2)
       }
 
       // We've reached the end of the second sequence, so:
@@ -71,7 +71,7 @@ extension Product2: Sequence {
 
       i2 = base2.makeIterator()
       if let element2 = i2.next() {
-        return (element1: element1, element2: element2)
+        return (element1, element2)
       } else {
         return nil
       }
@@ -122,9 +122,9 @@ extension Product2: Collection where Base1: Collection {
   }
 
   @inlinable
-  public subscript(position: Index) -> (element1: Base1.Element,
-                                        element2: Base2.Element) {
-    (element1: base1[position.i1], element2: base2[position.i2])
+  public subscript(position: Index) -> (Base1.Element,
+                                        Base2.Element) {
+    (base1[position.i1], base2[position.i2])
   }
 
   /// Forms an index from a pair of base indices, normalizing