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Convert some functions to return Cow<'static,str> instead of String to reduce potential reallocations

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This commit is contained in:
klensy 2021-08-22 19:55:45 +03:00
parent 2ad56d5c90
commit c565339c37
5 changed files with 53 additions and 51 deletions
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2
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),