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Rollup merge of #4830 - lzutao:str-repeat, r=flip1995

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use more efficient code to generate repeated string

see https://rust.godbolt.org/z/z9vrFP for comparison

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Philipp Krones 2019-11-23 18:16:03 +01:00 committed by GitHub
commit b4524004e0
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clippy_lints/src/strings.rs
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@ -154,7 +154,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for StringLitAsBytes {
if let LitKind::Str(ref lit_content, style) = lit.node { if let LitKind::Str(ref lit_content, style) = lit.node {
let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#); let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#);
let expanded = if let StrStyle::Raw(n) = style { let expanded = if let StrStyle::Raw(n) = style {
let term = (0..n).map(|_| '#').collect::<String>(); let term = "#".repeat(usize::from(n));
format!("r{0}\"{1}\"{0}", term, lit_content.as_str()) format!("r{0}\"{1}\"{0}", term, lit_content.as_str())
} else { } else {
format!("\"{}\"", lit_content.as_str()) format!("\"{}\"", lit_content.as_str())