From 2909de557c6f8010224966f80d96f1d346d7adfb Mon Sep 17 00:00:00 2001
From: dianqk <dianqk@dianqk.net>
Date: Wed, 6 Aug 2025 20:26:00 +0800
Subject: [PATCH] simplifycfg: Mark as changed when start is modified in
 collapse goto chain

---
 compiler/rustc_mir_transform/src/simplify.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_mir_transform/src/simplify.rs b/compiler/rustc_mir_transform/src/simplify.rs
index db933da641371..468ef742dfb73 100644
--- a/compiler/rustc_mir_transform/src/simplify.rs
+++ b/compiler/rustc_mir_transform/src/simplify.rs
@@ -225,6 +225,7 @@ impl<'a, 'tcx> CfgSimplifier<'a, 'tcx> {
             current = target;
         }
         let last = current;
+        *changed |= *start != last;
         *start = last;
         while let Some((current, mut terminator)) = terminators.pop() {
             let Terminator { kind: TerminatorKind::Goto { ref mut target }, .. } = terminator