Add "late specifiers" to attributed types.

This is needed to account for 'nonisolated' occuring after type
attributes within a protocol conformance.

Author: DougGregor

CodeGeneration/Sources/SyntaxSupport/Child.swift

@@ -47,7 +47,8 @@ public enum ChildKind {
     kind: SyntaxNodeKind,
     collectionElementName: String? = nil,
     defaultsToEmpty: Bool = false,
-    deprecatedCollectionElementName: String? = nil
+    deprecatedCollectionElementName: String? = nil,
+    generateDeprecatedAddFunction: Bool = true
   )
   /// The child is a token that matches one of the given `choices`.
   /// If `requiresLeadingSpace` or `requiresTrailingSpace` is not `nil`, it
@@ -132,7 +133,7 @@ public class Child: NodeChoiceConvertible {
       return kind
     case .nodeChoices:
       return .syntax
-    case .collection(kind: let kind, _, _, _):
+    case .collection(kind: let kind, _, _, _, _):
       return kind
     case .token:
       return .token
@@ -268,7 +269,7 @@ public class Child: NodeChoiceConvertible {
   /// Whether this child has syntax kind `UnexpectedNodes`.
   public var isUnexpectedNodes: Bool {
     switch kind {
-    case .collection(kind: .unexpectedNodes, _, _, _):
+    case .collection(kind: .unexpectedNodes, _, _, _, _):
       return true
     default:
       return false
@@ -283,7 +284,7 @@ public class Child: NodeChoiceConvertible {
       return choices.isEmpty
     case .node(let kind):
       return kind.isBase
-    case .collection(kind: let kind, _, _, _):
+    case .collection(kind: let kind, _, _, _, _):
       return kind.isBase
     case .token:
       return false

CodeGeneration/Sources/SyntaxSupport/GrammarGenerator.swift

@@ -41,7 +41,7 @@ struct GrammarGenerator {
     case .nodeChoices(let choices, _):
       let choicesDescriptions = choices.map { grammar(for: $0) }
       return "(\(choicesDescriptions.joined(separator: " | ")))\(optionality)"
-    case .collection(kind: let kind, _, _, _):
+    case .collection(kind: let kind, _, _, _, _):
       return "\(kind.doccLink)\(optionality)"
     case .token(let choices, _, _):
       if choices.count == 1 {

CodeGeneration/Sources/SyntaxSupport/Node.swift

@@ -391,7 +391,7 @@ fileprivate extension Child {
       return [kind]
     case .nodeChoices(let choices, _):
       return choices.flatMap(\.kinds)
-    case .collection(kind: let kind, _, _, _):
+    case .collection(kind: let kind, _, _, _, _):
       return [kind]
     case .token:
       return [.token]

CodeGeneration/Sources/SyntaxSupport/TypeNodes.swift

@@ -57,6 +57,13 @@ public let TYPE_NODES: [Node] = [
         kind: .collection(kind: .attributeList, collectionElementName: "Attribute", defaultsToEmpty: true),
         documentation: "A list of attributes that can be attached to the type, such as `@escaping`."
       ),
+      Child(
+        name: "lateSpecifiers",
+        kind: .collection(kind: .typeSpecifierList, collectionElementName: "Specifier", defaultsToEmpty: true,
+                          generateDeprecatedAddFunction: false),
+        documentation:
+          "A list of specifiers that can be attached to the type after the attributes, such as 'nonisolated'."
+      ),
       Child(
         name: "baseType",
         kind: .node(kind: .type),

CodeGeneration/Sources/Utils/SyntaxBuildableChild.swift

@@ -33,7 +33,7 @@ extension Child {
       buildableKind = .node(kind: kind)
     case .nodeChoices:
       buildableKind = .node(kind: .syntax)
-    case .collection(kind: let kind, _, _, _):
+    case .collection(kind: let kind, _, _, _, _):
       buildableKind = .node(kind: kind)
     case .token:
       buildableKind = .token(self.tokenKind!)
@@ -65,7 +65,7 @@ extension Child {
         return ExprSyntax("nil")
       }
     }
-    if case .collection(_, _, defaultsToEmpty: true, _) = kind {
+    if case .collection(_, _, defaultsToEmpty: true, _, _) = kind {
       return ExprSyntax("[]")
     }
     guard let token = token, isToken else {

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/RenamedChildrenCompatibilityFile.swift

@@ -85,7 +85,8 @@ func makeCompatibilityAddMethod(for child: Child) -> DeclSyntax? {
       kind: _,
       collectionElementName: let collectionElementName?,
       defaultsToEmpty: _,
-      deprecatedCollectionElementName: let deprecatedCollectionElementName?
+      deprecatedCollectionElementName: let deprecatedCollectionElementName?,
+      generateDeprecatedAddFunction: _
     ) = child.kind
   {
     let childEltType = childNode.collectionElementType.syntaxBaseName

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntax/SyntaxNodesFile.swift

@@ -176,7 +176,7 @@ func syntaxNode(nodesStartingWith: [Character]) -> SourceFileSyntax {
           // If needed, this could be added in the future, but for now withUnexpected should be sufficient.
           if let childNode = SYNTAX_NODE_MAP[child.syntaxNodeKind]?.collectionNode,
             !child.isUnexpectedNodes,
-            case .collection(_, collectionElementName: let childElt?, _, _) = child.kind
+             case .collection(_, collectionElementName: let childElt?, _, _, generateDeprecatedAddFunction: true) = child.kind
           {
             let childEltType = childNode.collectionElementType.syntaxBaseName