Fix build error

feature/init-positional-with-argument-rep

Author: roanutil

Tests/ArgumentEncodingTests/ArgumentGroupTests.swift

@@ -250,28 +250,14 @@ final class ArgumentGroupTests: XCTestCase {
     }
 }
 
-#if swift(>=6) && swift(<6.0.2)
-    extension Array: @retroactive ArgumentGroup, @retroactive FormatterNode {
-        public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
+extension Array: ArgumentGroup, FormatterNode {
+    public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
 
-        public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
-    }
-
-    extension Dictionary: @retroactive ArgumentGroup, @retroactive FormatterNode {
-        public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
-
-        public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
-    }
-#else
-    extension Array: ArgumentGroup, FormatterNode {
-        public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
-
-        public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
-    }
+    public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
+}
 
-    extension Dictionary: ArgumentGroup, FormatterNode {
-        public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
+extension Dictionary: ArgumentGroup, FormatterNode {
+    public var flagFormatter: ArgumentEncoding.FlagFormatter { FlagFormatter(prefix: .doubleDash) }
 
-        public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
-    }
-#endif
+    public var optionFormatter: ArgumentEncoding.OptionFormatter { OptionFormatter(prefix: .doubleDash) }
+}