From 15286f220e54e39dc533e43a492679e957bf332b Mon Sep 17 00:00:00 2001
From: Scott McMurray <scottmcm@users.noreply.github.com>
Date: Thu, 3 Jul 2025 17:42:43 -0700
Subject: [PATCH] Remove some unnecessary `unsafe` in VecCache

---
 compiler/rustc_data_structures/src/vec_cache.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compiler/rustc_data_structures/src/vec_cache.rs b/compiler/rustc_data_structures/src/vec_cache.rs
index 3b448c056b748..df83d15b5f943 100644
--- a/compiler/rustc_data_structures/src/vec_cache.rs
+++ b/compiler/rustc_data_structures/src/vec_cache.rs
@@ -76,8 +76,8 @@ impl SlotIndex {
                 index_in_bucket: idx as usize,
             };
         }
-        // SAFETY: We already ruled out idx 0, so `checked_ilog2` can't return `None`.
-        let bucket = unsafe { idx.checked_ilog2().unwrap_unchecked() as usize };
+        // We already ruled out idx 0, so this `ilog2` never panics (and the check optimizes away)
+        let bucket = idx.ilog2() as usize;
         let entries = 1 << bucket;
         SlotIndex {
             bucket_idx: bucket - FIRST_BUCKET_SHIFT + 1,