[Swift 4] Update Treap

Author: remlostime

Treap/Treap/Treap.xcodeproj/project.pbxproj

@@ -243,7 +243,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.willowtree.TreapTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -255,7 +255,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.willowtree.TreapTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};

Treap/Treap/TreapTests/TreapTests.swift

@@ -38,6 +38,13 @@ class TreapTests: XCTestCase {
     super.tearDown()
   }
 
+  func testSwift4() {
+    // last checked with Xcode 9.0b4
+    #if swift(>=4.0)
+      print("Hello, Swift 4!")
+    #endif
+  }
+
   func testSanity() {
     var treap = Treap<Int, String>.empty
     treap = treap.set(key: 5, val: "a").set(key: 7, val: "b")