Add new group for special declarations attributes with spacial syntax

Author: kimdv

Sources/SwiftParser/TokenPrecedence.swift

@@ -36,6 +36,7 @@ enum TokenPrecedence: Comparable {
   case weakBracketClose
   /// Keywords that start a new statement.
   case stmtKeyword
+  case declarationAttributeWithSpecialSyntax
   /// The '{' token because it typically marks the body of a declaration.
   /// `closingDelimiter` must have type `strongPunctuator`
   case openingBrace(closingDelimiter: RawTokenKind)
@@ -82,18 +83,20 @@ enum TokenPrecedence: Comparable {
         return 6
       case .stmtKeyword:
         return 7
-      case .strongPunctuator:
+      case .declarationAttributeWithSpecialSyntax:
         return 8
-      case .openingBrace:
+      case .strongPunctuator:
         return 9
-      case .closingBrace:
+      case .openingBrace:
         return 10
-      case .declKeyword:
+      case .closingBrace:
         return 11
-      case .openingPoundIf:
+      case .declKeyword:
         return 12
-      case .closingPoundIf:
+      case .openingPoundIf:
         return 13
+      case .closingPoundIf:
+        return 14
       }
     }
 
@@ -232,81 +235,86 @@ enum TokenPrecedence: Comparable {
       .__setter_access, .indirect, .isolated, .nonisolated, .distributed, ._local,
       .inout, ._mutating, ._borrow, ._borrowing, .borrowing, ._consuming, .consuming, .consume,
       // Accessors
-      .get, .set, .didSet, .willSet,.unsafeAddress, .addressWithOwner, .addressWithNativeOwner, .unsafeMutableAddress,
+      .get, .set, .didSet, .willSet, .unsafeAddress, .addressWithOwner, .addressWithNativeOwner, .unsafeMutableAddress,
       .mutableAddressWithOwner, .mutableAddressWithNativeOwner, ._read, ._modify,
       // Misc
       .import:
       self = .declKeyword
 
-    case // Treat all other keywords as expression keywords in the absence of any better information.
-      .__owned,
-      .__shared,
-      ._alignment,
+    case  // `DeclarationAttributeWithSpecialSyntax`
+    ._alignment,
       ._backDeploy,
       ._cdecl,
-      ._Class,
-      ._compilerInitialized,
-      ._const,
       ._documentation,
       ._dynamicReplacement,
       ._effects,
       ._expose,
-      ._forward,
       ._implements,
-      ._linear,
-      ._move,
-      ._NativeClass,
-      ._NativeRefCountedObject,
-      ._noMetadata,
       ._nonSendable,
       ._objcImplementation,
       ._objcRuntimeName,
-      ._opaqueReturnTypeOf,
       ._optimize,
       ._originallyDefinedIn,
-      ._PackageDescription,
       ._private,
       ._projectedValueProperty,
-      ._RefCountedObject,
       ._semantics,
       ._specialize,
       ._spi,
       ._spi_available,
       ._swift_native_objc_runtime_base,
-      ._Trivial,
-      ._TrivialAtMost,
       ._typeEraser,
       ._unavailableFromAsync,
+      .`rethrows`,
+      .attached,
+      .available,
+      .backDeployed,
+      .derivative,
+      .differentiable,
+      .exclusivity,
+      .inline,
+      .objc,
+      .transpose:
+      self = .declarationAttributeWithSpecialSyntax
+    case  // Treat all other keywords as expression keywords in the absence of any better information.
+    .__owned,
+      .__shared,
+      ._Class,
+      ._compilerInitialized,
+      ._const,
+      ._forward,
+      ._linear,
+      ._move,
+      ._NativeClass,
+      ._NativeRefCountedObject,
+      ._noMetadata,
+      ._opaqueReturnTypeOf,
+      ._PackageDescription,
+      ._RefCountedObject,
+      ._Trivial,
+      ._TrivialAtMost,
       ._underlyingVersion,
       ._UnknownLayout,
       ._version,
       .accesses,
       .any,
       .assignment,
       .associativity,
-      .attached,
       .autoclosure,
       .availability,
-      .available,
-      .backDeployed,
       .before,
       .block,
       .canImport,
       .compiler,
       .convention,
       .cType,
       .deprecated,
-      .derivative,
-      .differentiable,
       .escaping,
-      .exclusivity,
       .exported,
       .file,
       .discard,
       .forward,
       .higherThan,
       .initializes,
-      .inline,
       .introduced,
       .kind,
       .left,
@@ -320,7 +328,6 @@ enum TokenPrecedence: Comparable {
       .noDerivative,
       .noescape,
       .none,
-      .objc,
       .obsoleted,
       .of,
       .Protocol,
@@ -334,7 +341,6 @@ enum TokenPrecedence: Comparable {
       .spiModule,
       .swift,
       .target,
-      .transpose,
       .Type,
       .unavailable,
       .unchecked,