require Swift 6.1; add Join package trait

Author: RandomHashTags

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:6.0
+// swift-tools-version:6.1
 
 import PackageDescription
 
@@ -10,6 +10,13 @@ let package = Package(
             targets: ["VariableLengthArray"]
         )
     ],
+    traits: [
+        .default(enabledTraits: ["Join"]),
+        .trait(
+            name: "Join",
+            description: "Enables functionality to join Variable Length Arrays."
+        )
+    ],
     targets: [
         .target(
             name: "VariableLengthArray"

Sources/VariableLengthArray/Joined.swift

@@ -1,5 +1,5 @@
 
-#if compiler(>=6.2)
+#if Join && compiler(>=6.2)
 
 extension VLArray {
     @inlinable

Tests/swift-variablelengtharrayTests/VariableLengthArrayTests.swift

@@ -86,7 +86,7 @@ struct VariableLengthArrayTests {
     ) {
     }
 
-    #if compiler(>=6.2)
+    #if Join && compiler(>=6.2)
     @Test
     func joinedVLArrayVL() {
         VLArray<UInt8>.create(amount: 5, default: 0) { first in