From 4ab333a7ce933d5204944852ab17a4fabe88c364 Mon Sep 17 00:00:00 2001
From: Richard Wei <rxwei@apple.com>
Date: Thu, 24 Feb 2022 15:02:41 -0800
Subject: [PATCH] Perform unaligned store properly in
 'CaptureStructure.encode(to:)`.

---
 Sources/_MatchingEngine/Regex/Parse/CaptureStructure.swift | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Sources/_MatchingEngine/Regex/Parse/CaptureStructure.swift b/Sources/_MatchingEngine/Regex/Parse/CaptureStructure.swift
index 68c3ce34..7faf4f5f 100644
--- a/Sources/_MatchingEngine/Regex/Parse/CaptureStructure.swift
+++ b/Sources/_MatchingEngine/Regex/Parse/CaptureStructure.swift
@@ -331,9 +331,10 @@ extension CaptureStructure {
     assert(
       buffer.count >=
         MemoryLayout<SerializationVersion>.stride + MemoryLayout<Code>.stride)
-    // Encode version.
-    buffer.storeBytes(
-      of: Self.currentSerializationVersion, as: SerializationVersion.self)
+    // Encode version (unaligned store).
+    withUnsafeBytes(of: Self.currentSerializationVersion) {
+      buffer.copyMemory(from: $0)
+    }
     // Encode contents.
     var offset = MemoryLayout<SerializationVersion>.stride
     /// Appends a code to the buffer, advancing the offset to the next position.