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Optimize Cursor::look_ahead

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Cloning a tt is cheap, but not free (there's Arc inside).
This commit is contained in:
Aleksey Kladov 2020-09-03 23:26:59 +02:00
parent 850c3219fb
commit 09d3db2e59
3 changed files with 15 additions and 10 deletions
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11
compiler/rustc_expand/src/proc_macro_server.rs
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@ -47,13 +47,18 @@ impl ToInternal<token::DelimToken> for Delimiter {
}
}
impl FromInternal<(TreeAndJoint, Option<tokenstream::TokenTree>, &'_ ParseSess, &'_ mut Vec<Self>)>
for TokenTree<Group, Punct, Ident, Literal>
impl
FromInternal<(
TreeAndJoint,
Option<&'_ tokenstream::TokenTree>,
&'_ ParseSess,
&'_ mut Vec<Self>,
)> for TokenTree<Group, Punct, Ident, Literal>
{
fn from_internal(
((tree, is_joint), look_ahead, sess, stack): (
TreeAndJoint,
Option<tokenstream::TokenTree>,
Option<&tokenstream::TokenTree>,
&ParseSess,
&mut Vec<Self>,
),