3 files changed, 6 insertions, 6 deletions
diff --git a/compiler/rustc_index/src/bit_set.rs b/compiler/rustc_index/src/bit_set.rs
index 686cb6dac49..15179392c88 100644
--- a/compiler/rustc_index/src/bit_set.rs
+++ b/compiler/rustc_index/src/bit_set.rs
@@ -1091,7 +1091,7 @@ impl<T: Idx> ToString for BitSet<T> {
                 assert!(mask <= 0xFF);
                 let byte = word & mask;
 
-                result.push_str(&format!("{}{:02x}", sep, byte));
+                result.push_str(&format!("{sep}{byte:02x}"));
 
                 if remain <= 8 {
                     break;
diff --git a/compiler/rustc_index/src/interval.rs b/compiler/rustc_index/src/interval.rs
index 3592fb33077..d809740c6ab 100644
--- a/compiler/rustc_index/src/interval.rs
+++ b/compiler/rustc_index/src/interval.rs
@@ -135,10 +135,7 @@ impl<I: Idx> IntervalSet<I> {
         };
         debug_assert!(
             self.check_invariants(),
-            "wrong intervals after insert {:?}..={:?} to {:?}",
-            start,
-            end,
-            self
+            "wrong intervals after insert {start:?}..={end:?} to {self:?}"
         );
         result
     }
diff --git a/compiler/rustc_index/src/vec/tests.rs b/compiler/rustc_index/src/vec/tests.rs
index 915d2e8bcb3..cb0f0db220d 100644
--- a/compiler/rustc_index/src/vec/tests.rs
+++ b/compiler/rustc_index/src/vec/tests.rs
@@ -3,7 +3,10 @@
 // Allows the macro invocation below to work
 use crate as rustc_index;
 
-rustc_macros::newtype_index!(struct MyIdx { MAX = 0xFFFF_FFFA });
+rustc_macros::newtype_index! {
+    #[max = 0xFFFF_FFFA]
+    struct MyIdx {}
+}
 
 #[test]
 fn index_size_is_optimized() {