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Merge pull request #1204 from dtolnay/prealloc

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Preallocate TokenBuffer vector
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David Tolnay 2022-07-24 23:01:42 -07:00 committed by GitHub
commit 548332634d
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1 changed files with 3 additions and 2 deletions
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src/buffer.rs
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@ -59,9 +59,10 @@ impl TokenBuffer {
fn inner_new(stream: TokenStream, up: *const Entry) -> TokenBuffer {
// Build up the entries list, recording the locations of any Groups
// in the list to be processed later.
let mut entries = Vec::new();
let iterator = stream.into_iter();
let mut entries = Vec::with_capacity(iterator.size_hint().0 + 1);
let mut groups = Vec::new();
for tt in stream {
for tt in iterator {
match tt {
TokenTree::Ident(ident) => {
entries.push(Entry::Ident(ident));