From 748e6fe23d24ebda3c85afd2eba5f73ab36071c9 Mon Sep 17 00:00:00 2001
From: Logan Gatlin <lgatlin@cloudflare.com>
Date: Thu, 26 Mar 2026 15:44:59 -0500
Subject: [PATCH] fix

---
 src/module/mod.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/module/mod.rs b/src/module/mod.rs
index 16adf712..8ad114e2 100644
--- a/src/module/mod.rs
+++ b/src/module/mod.rs
@@ -408,11 +408,14 @@ impl Module {
         }
 
         // 4. Find undeclared functions and synthesize a Declared element segment.
-        let undeclared: Vec<_> = ref_funcs
+        let mut undeclared: Vec<_> = ref_funcs
             .iter()
             .copied()
             .filter(|f| !declared.contains(f))
             .collect();
+        // Sort to ensure we emit the Declared element segment deterministically,
+        // regardless of IdHashSet iteration order.
+        undeclared.sort_unstable();
         if !undeclared.is_empty() {
             log::debug!(
                 "synthesizing Declared element segment for {} undeclared ref.func references",