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Avoid cloning the contents of a TokenStream in a few places

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This commit is contained in:
Aaron Hill 2020-09-14 01:45:10 -04:00
parent cb2462c53f
commit f6aec82d4d
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3 changed files with 12 additions and 11 deletions
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10
compiler/rustc_parse/src/parser/mod.rs
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@ -833,15 +833,15 @@ impl<'a> Parser<'a> {
}
let frame = &self.token_cursor.frame;
looker(&match frame.tree_cursor.look_ahead(dist - 1) {
match frame.tree_cursor.look_ahead(dist - 1) {
Some(tree) => match tree {
TokenTree::Token(token) => token,
TokenTree::Token(token) => looker(token),
TokenTree::Delimited(dspan, delim, _) => {
Token::new(token::OpenDelim(delim), dspan.open)
looker(&Token::new(token::OpenDelim(*delim), dspan.open))
}
},
None => Token::new(token::CloseDelim(frame.delim), frame.span.close),
})
None => looker(&Token::new(token::CloseDelim(frame.delim), frame.span.close)),
}
}
/// Returns whether any of the given keywords are `dist` tokens ahead of the current one.