From cbdac2f0e9da7c1b379bed6da49bde43feb3eed1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Rakic?= <remy.rakic+github@gmail.com>
Date: Sun, 22 Dec 2024 23:18:40 +0000
Subject: [PATCH] improve `bit_set` assertion

it missed the index and bounds info
---
 compiler/rustc_index/src/bit_set.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_index/src/bit_set.rs b/compiler/rustc_index/src/bit_set.rs
index 664b77fd49eb..38e2dbbde7d0 100644
--- a/compiler/rustc_index/src/bit_set.rs
+++ b/compiler/rustc_index/src/bit_set.rs
@@ -179,7 +179,12 @@ impl<T: Idx> BitSet<T> {
     /// Insert `elem`. Returns whether the set has changed.
     #[inline]
     pub fn insert(&mut self, elem: T) -> bool {
-        assert!(elem.index() < self.domain_size);
+        assert!(
+            elem.index() < self.domain_size,
+            "inserting element at index {} but domain size is {}",
+            elem.index(),
+            self.domain_size,
+        );
         let (word_index, mask) = word_index_and_mask(elem);
         let word_ref = &mut self.words[word_index];
         let word = *word_ref;