From 4df21f2ca0a51e0687fd7443c99ed32edb080988 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 3 Oct 2024 14:33:28 +1000
Subject: [PATCH] Downgrade a `&mut self` to `&self`.

---
 compiler/rustc_infer/src/infer/region_constraints/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_infer/src/infer/region_constraints/mod.rs b/compiler/rustc_infer/src/infer/region_constraints/mod.rs
index c7dd65330be..6a7f30a5dcf 100644
--- a/compiler/rustc_infer/src/infer/region_constraints/mod.rs
+++ b/compiler/rustc_infer/src/infer/region_constraints/mod.rs
@@ -372,7 +372,7 @@ pub fn data(&self) -> &RegionConstraintData<'tcx> {
         &self.storage.data
     }
 
-    pub(super) fn start_snapshot(&mut self) -> RegionSnapshot {
+    pub(super) fn start_snapshot(&self) -> RegionSnapshot {
         debug!("RegionConstraintCollector: start_snapshot");
         RegionSnapshot { any_unifications: self.storage.any_unifications }
     }