From e782e6b0b1a37a38ef2b5bf52e9b19093e8e3e3a Mon Sep 17 00:00:00 2001
From: Ben Barham <ben_barham@apple.com>
Date: Fri, 23 May 2025 17:27:57 -0700
Subject: [PATCH] Add a `SendableMetatype` conformance to `Macro`

`Macro.Type` is used in various `Error`s and since SE-0470, needs to
conform to `SendableMetatype`.

(cherry picked from commit 0efe93161ae29830b57fd82317bbf697ae99cf9f)
---
 Sources/SwiftSyntaxMacros/MacroProtocols/Macro.swift | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Sources/SwiftSyntaxMacros/MacroProtocols/Macro.swift b/Sources/SwiftSyntaxMacros/MacroProtocols/Macro.swift
index 6203a6f9127..3045b364475 100644
--- a/Sources/SwiftSyntaxMacros/MacroProtocols/Macro.swift
+++ b/Sources/SwiftSyntaxMacros/MacroProtocols/Macro.swift
@@ -10,9 +10,18 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if compiler(>=6.2)
+/// Describes a macro.
+public protocol Macro: SendableMetatype {
+  /// How the resulting expansion should be formatted, `.auto` by default.
+  /// Use `.disabled` for the expansion to be used as is.
+  static var formatMode: FormatMode { get }
+}
+#else
 /// Describes a macro.
 public protocol Macro {
   /// How the resulting expansion should be formatted, `.auto` by default.
   /// Use `.disabled` for the expansion to be used as is.
   static var formatMode: FormatMode { get }
 }
+#endif