From 548dc3f3c42c3930730cdab8fc2fcd6c3a52c58d Mon Sep 17 00:00:00 2001
From: Edward Amsden <edward@blackriversoft.com>
Date: Mon, 11 Dec 2023 19:06:45 -0600
Subject: [PATCH] hamt: when preserving, actually write outermost stem pointer
 back to mutable self

---
 rust/ares/src/hamt.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/ares/src/hamt.rs b/rust/ares/src/hamt.rs
index 4028e82..d166d17 100644
--- a/rust/ares/src/hamt.rs
+++ b/rust/ares/src/hamt.rs
@@ -500,6 +500,7 @@ impl<T: Copy + Preserve> Preserve for Hamt<T> {
         if stack.is_in_frame(self.0) {
             let dest_stem = stack.struct_alloc_in_previous_frame(1);
             copy_nonoverlapping(self.0, dest_stem, 1);
+            self.0 = dest_stem;
             if stack.is_in_frame((*dest_stem).buffer) {
                 let dest_buffer = stack.struct_alloc_in_previous_frame((*dest_stem).size());
                 copy_nonoverlapping((*dest_stem).buffer, dest_buffer, (*dest_stem).size());