Revert "Migrate Stack to Swift 3"

This reverts commit 99c0072.

Author: nemanjavlahovic

Stack/Stack.playground/Contents.swift

@@ -12,7 +12,7 @@
 */
 
 public struct Stack<T> {
-  fileprivate var array = [T]()
+  private var array = [T]()
 
   public var count: Int {
     return array.count
@@ -36,10 +36,10 @@ public struct Stack<T> {
 }
 
 // Create a stack and put some elements on it already.
-var stackOfNames = Stack(array:["Carl", "Lisa", "Stephanie", "Jeff", "Wade"])
+var stackOfNames = Stack(array: ["Carl", "Lisa", "Stephanie", "Jeff", "Wade"])
 
 // Add an element to the top of the stack.
-stackOfNames.push(element: "Mike")
+stackOfNames.push("Mike")
 
 // The stack is now ["Carl", "Lisa", "Stephanie", "Jeff", "Wade", "Mike"]
 print(stackOfNames.array)

Stack/Stack.swift

@@ -4,7 +4,7 @@
   Push and pop are O(1) operations.
 */
 public struct Stack<T> {
-  fileprivate var array = [T]()
+  private var array = [T]()
 
   public var isEmpty: Bool {
     return array.isEmpty
@@ -14,7 +14,7 @@ public struct Stack<T> {
     return array.count
   }
 
-  public mutating func push(_ element: T) {
+  public mutating func push(element: T) {
     array.append(element)
   }
 
@@ -27,10 +27,10 @@ public struct Stack<T> {
   }
 }
 
-extension Stack: Sequence {
-    public func makeIterator() -> AnyIterator<T> {
+extension Stack: SequenceType {
+    public func generate() -> AnyGenerator<T> {
         var curr = self
-        return AnyIterator {
+        return AnyGenerator {
             _ -> T? in
             return curr.pop()
         }

Stack/Tests/Tests.xcodeproj/project.pbxproj

@@ -88,7 +88,6 @@
 				TargetAttributes = {
 					7B2BBC7F1C779D720067B71D = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
 					};
 				};
 			};
@@ -221,7 +220,6 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -233,7 +231,6 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};