Fix access control

Author: Tim Vermeulen

Sources/Algorithms/EitherSequence.swift

@@ -62,17 +62,22 @@ internal enum EitherSequence<Left: Sequence, Right: Sequence>
 }
 
 extension EitherSequence: Sequence {
-  public struct Iterator: IteratorProtocol {
-    var left: Left.Iterator?
-    var right: Right.Iterator?
+  @usableFromInline
+  internal struct Iterator: IteratorProtocol {
+    @usableFromInline
+    internal var left: Left.Iterator?
+    
+    @usableFromInline
+    internal var right: Right.Iterator?
 
-    public mutating func next() -> Left.Element? {
+    @inlinable
+    internal mutating func next() -> Left.Element? {
       left?.next() ?? right?.next()
     }
   }
 
   @usableFromInline
-  func makeIterator() -> Iterator {
+  internal func makeIterator() -> Iterator {
     switch self {
     case .left(let left):
       return Iterator(left: left.makeIterator(), right: nil)

Sources/Algorithms/Intersperse.swift

@@ -220,7 +220,8 @@ internal struct InterspersedMap<Base: Sequence, Result> {
 }
 
 extension InterspersedMap: Sequence {
-  public struct Iterator: IteratorProtocol {
+  @usableFromInline
+  internal struct Iterator: IteratorProtocol {
     @usableFromInline
     internal var base: Base.Iterator
 
@@ -245,14 +246,14 @@ extension InterspersedMap: Sequence {
     }
 
     @usableFromInline
-    enum State {
+    internal enum State {
       case start
       case element(Base.Element)
       case separator(previous: Base.Element)
     }
 
     @inlinable
-    public mutating func next() -> Result? {
+    internal mutating func next() -> Result? {
       switch state {
       case .start:
         guard let first = base.next() else { return nil }
@@ -270,7 +271,7 @@ extension InterspersedMap: Sequence {
   }
 
   @inlinable
-  public func makeIterator() -> Iterator {
+  internal func makeIterator() -> Iterator {
     Iterator(
       base: base.makeIterator(),
       transform: transform,