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rustc_ast: Never clone empty token streams in mutable visitor

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This commit is contained in:
Vadim Petrochenkov 2020-11-04 16:57:51 +03:00
parent 63343f6323
commit 8def2fc122
1 changed files with 1 additions and 1 deletions
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compiler/rustc_ast/src/mut_visit.rs
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@ -656,7 +656,7 @@ pub fn visit_tt<T: MutVisitor>(tt: &mut TokenTree, vis: &mut T) {
// No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
pub fn visit_tts<T: MutVisitor>(TokenStream(tts): &mut TokenStream, vis: &mut T) {
if vis.token_visiting_enabled() {
if vis.token_visiting_enabled() && !tts.is_empty() {
let tts = Lrc::make_mut(tts);
visit_vec(tts, |(tree, _is_joint)| visit_tt(tree, vis));
}