1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_parse/src/lexer/unicode_chars.rs b/compiler/rustc_parse/src/lexer/unicode_chars.rs
index 829d9693e55..bbfb160ebf7 100644
--- a/compiler/rustc_parse/src/lexer/unicode_chars.rs
+++ b/compiler/rustc_parse/src/lexer/unicode_chars.rs
@@ -349,7 +349,7 @@ pub(super) fn check_for_substitution(
     let span = Span::with_root_ctxt(pos, pos + Pos::from_usize(ch.len_utf8() * count));
 
     let Some((_, ascii_name, token)) = ASCII_ARRAY.iter().find(|&&(s, _, _)| s == ascii_str) else {
-        let msg = format!("substitution character not found for '{}'", ch);
+        let msg = format!("substitution character not found for '{ch}'");
         reader.sess.span_diagnostic.span_bug_no_panic(span, msg);
         return (None, None);
     };