Support Swift/SourceKit 6

.bazelrc

@@ -3,3 +3,4 @@ build --macos_minimum_os=12
 build --repo_env=CC=clang
 test --test_output=errors
 test --spawn_strategy=standalone
+test --macos_minimum_os=13

.github/workflows/xcodebuild.yml

@@ -18,4 +18,4 @@ jobs:
         with:
           xcode-version: ${{ matrix.xcode_version }}
       - run: xcodebuild -version
-      - run: xcodebuild -scheme sourcekitten -parallel-testing-enabled NO test -destination platform=macOS
+      - run: xcodebuild -scheme SourceKitten-Package -parallel-testing-enabled NO test -destination platform=macOS

Source/SourceKittenFramework/SwiftDeclarationAttributeKind.swift

@@ -201,4 +201,18 @@ public enum SwiftDeclarationAttributeKind: String, CaseIterable {
     case _rawLayout = "source.decl.attribute._rawLayout"
     case _section = "source.decl.attribute._section"
     case _used = "source.decl.attribute._used"
+
+    // Only available in Swift >= 6.0
+    case _extern = "source.decl.attribute._extern"
+    case _resultDependsOnSelf = "source.decl.attribute._resultDependsOnSelf"
+    case _preInverseGenerics = "source.decl.attribute._preInverseGenerics"
+    case implementation = "source.decl.attribute.implementation"
+    case _allowFeatureSuppression = "source.decl.attribute._allowFeatureSuppression"
+    case _noRuntime = "source.decl.attribute._noRuntime"
+    case _staticExclusiveOnly = "source.decl.attribute._staticExclusiveOnly"
+    case extractConstantsFromMembers = "source.decl.attribute.extractConstantsFromMembers"
+    case _unsafeNonescapableResult = "source.decl.attribute._unsafeNonescapableResult"
+    case _noExistentials = "source.decl.attribute._noExistentials"
+    case _noObjCBridging = "source.decl.attribute._noObjCBridging"
+    case _nonescapable = "source.decl.attribute._nonescapable"
 }