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Auto merge of #88262 - klensy:pprust-cow, r=nagisa

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Cow'ify some pprust methods

Reduce number of potential needless de/allocations by using `Cow<'static, str>` instead of explicit `String` type.
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bors 2021-08-29 17:46:29 +00:00
commit ae0b03bc6b
5 changed files with 53 additions and 51 deletions
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compiler/rustc_expand/src/mbe/macro_rules.rs
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@ -1221,7 +1221,7 @@ fn is_in_follow(tok: &mbe::TokenTree, kind: NonterminalKind) -> IsInFollow {
fn quoted_tt_to_string(tt: &mbe::TokenTree) -> String {
match *tt {
mbe::TokenTree::Token(ref token) => pprust::token_to_string(&token),
mbe::TokenTree::Token(ref token) => pprust::token_to_string(&token).into(),
mbe::TokenTree::MetaVar(_, name) => format!("${}", name),
mbe::TokenTree::MetaVarDecl(_, name, Some(kind)) => format!("${}:{}", name, kind),
mbe::TokenTree::MetaVarDecl(_, name, None) => format!("${}:", name),