Nest "contains" usage

Author: DougGregor

Sources/SwiftRefactor/PackageManifest/AddTarget.swift

@@ -144,30 +144,32 @@ public struct AddTarget: ManifestEditRefactoringProvider {
         to: &auxiliaryFiles
       )
 
-      if #available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *), !manifest.description.contains("swift-syntax") {
-        newPackageCall =
-          try AddPackageDependency
-          .addPackageDependencyLocal(
-            .swiftSyntax(
-              version: configuration.swiftSyntaxVersion
-            ),
-            to: newPackageCall
-          )
-
-        // Look for the first import declaration and insert an
-        // import of `CompilerPluginSupport` there.
-        let newImport = "import CompilerPluginSupport\n"
-        for node in manifest.statements {
-          if let importDecl = node.item.as(ImportDeclSyntax.self) {
-            let insertPos = importDecl
-              .positionAfterSkippingLeadingTrivia
-            extraManifestEdits.append(
-              SourceEdit(
-                range: insertPos..<insertPos,
-                replacement: newImport
-              )
+      if #available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *) {
+        if !manifest.description.contains("swift-syntax") {
+          newPackageCall =
+            try AddPackageDependency
+            .addPackageDependencyLocal(
+              .swiftSyntax(
+                version: configuration.swiftSyntaxVersion
+              ),
+              to: newPackageCall
             )
-            break
+
+          // Look for the first import declaration and insert an
+          // import of `CompilerPluginSupport` there.
+          let newImport = "import CompilerPluginSupport\n"
+          for node in manifest.statements {
+            if let importDecl = node.item.as(ImportDeclSyntax.self) {
+              let insertPos = importDecl
+                .positionAfterSkippingLeadingTrivia
+              extraManifestEdits.append(
+                SourceEdit(
+                  range: insertPos..<insertPos,
+                  replacement: newImport
+                )
+              )
+              break
+            }
           }
         }
       }