1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_builtin_macros/src/concat.rs b/compiler/rustc_builtin_macros/src/concat.rs
index e5077d93674..59361510a67 100644
--- a/compiler/rustc_builtin_macros/src/concat.rs
+++ b/compiler/rustc_builtin_macros/src/concat.rs
@@ -21,7 +21,7 @@ pub fn expand_concat(
         match e.kind {
             ast::ExprKind::Lit(ref lit) => match lit.kind {
                 ast::LitKind::Str(ref s, _) | ast::LitKind::Float(ref s, _) => {
-                    accumulator.push_str(&s.as_str());
+                    accumulator.push_str(s.as_str());
                 }
                 ast::LitKind::Char(c) => {
                     accumulator.push(c);