Swift 4.2 Migration #748 - Depth First Search migrated to Swift 4.2

Author: gmotzespina

All-Pairs Shortest Paths/APSP/APSP.xcodeproj/project.pbxproj

@@ -196,7 +196,7 @@
 					};
 					493D8DF01CDD5B960089795A = {
 						CreatedOnToolsVersion = 7.3;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 1010;
 					};
 				};
 			};
@@ -420,7 +420,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSP";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -442,7 +443,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSP";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};

Depth-First Search/DepthFirstSearch.playground/Pages/Simple Example.xcplaygroundpage/Contents.swift

@@ -1,7 +1,4 @@
-// last checked with Xcode 9.0b4
-#if swift(>=4.0)
-print("Hello, Swift 4!")
-#endif
+// last checked with Xcode 10.1
 
 func depthFirstSearch(_ graph: Graph, source: Node) -> [String] {
     var nodesExplored = [source.label]

Depth-First Search/Tests/Tests.xcodeproj/project.pbxproj

@@ -234,7 +234,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -247,7 +247,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};