use more efficient code to generate repeated string

see https://rust.godbolt.org/z/z9vrFP for comparison
rust-lang · Nov 19, 2019 · 7a4c3d0 · 7a4c3d0
1 parent b4f1769
commit 7a4c3d0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/clippy_lints/src/strings.rs b/clippy_lints/src/strings.rs
@@ -154,7 +154,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for StringLitAsBytes {
                     if let LitKind::Str(ref lit_content, style) = lit.node {
                         let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#);
                         let expanded = if let StrStyle::Raw(n) = style {
-                            let term = (0..n).map(|_| '#').collect::<String>();
+                            let term = "#".repeat(n);
                             format!("r{0}\"{1}\"{0}", term, lit_content.as_str())
                         } else {
                             format!("\"{}\"", lit_content.as_str())