Merge pull request #2357 from hborla/minor-concurrency-annotations

[NFC] Minor annotations to minimize diagnostics under strict concurrency checking.

Author: hborla

Sources/SwiftSyntax/BumpPtrAllocator.swift

@@ -17,8 +17,8 @@
 public class BumpPtrAllocator {
   typealias Slab = UnsafeMutableRawBufferPointer
 
-  static private var GROWTH_DELAY: Int = 128
-  static private var SLAB_ALIGNMENT: Int = 8
+  static private let GROWTH_DELAY: Int = 128
+  static private let SLAB_ALIGNMENT: Int = 8
 
   /// Initial slab size.
   private var slabSize: Int

Sources/SwiftSyntax/MemoryLayout.swift

@@ -12,7 +12,7 @@
 
 // See `MemoryLayoutTest.swift`.
 @_spi(Testing) public enum SyntaxMemoryLayout {
-  public struct Value: Equatable {
+  public struct Value: Equatable, Sendable {
     var size: Int
     var stride: Int
     var alignment: Int

Sources/SwiftSyntax/Raw/RawSyntax.swift

@@ -945,7 +945,7 @@ extension RawSyntax: Identifiable {
 }
 
 /// See `SyntaxMemoryLayout`.
-var RawSyntaxDataMemoryLayouts: [String: SyntaxMemoryLayout.Value] = [
+let RawSyntaxDataMemoryLayouts: [String: SyntaxMemoryLayout.Value] = [
   "RawSyntaxData": .init(RawSyntaxData.self),
   "RawSyntaxData.Layout": .init(RawSyntaxData.Layout.self),
   "RawSyntaxData.ParsedToken": .init(RawSyntaxData.ParsedToken.self),

Sources/SwiftSyntax/Syntax.swift

@@ -309,7 +309,7 @@ extension Syntax {
 public struct SyntaxNode {}
 
 /// See `SyntaxMemoryLayout`.
-var SyntaxMemoryLayouts: [String: SyntaxMemoryLayout.Value] = [
+let SyntaxMemoryLayouts: [String: SyntaxMemoryLayout.Value] = [
   "Syntax": .init(Syntax.self),
   "Syntax.Info": .init(Syntax.Info.self),
   "Syntax.Info.Root": .init(Syntax.Info.Root.self),

Sources/SwiftSyntax/SyntaxIdentifier.swift

@@ -15,7 +15,7 @@
 public struct SyntaxIndexInTree: Comparable, Hashable, Sendable {
   let indexInTree: UInt32
 
-  static var zero: SyntaxIndexInTree = SyntaxIndexInTree(indexInTree: 0)
+  static let zero: SyntaxIndexInTree = SyntaxIndexInTree(indexInTree: 0)
 
   /// Assuming that this index points to the start of ``Raw``, so that it points
   /// to the next sibling of ``Raw``.