refactor: use by-ref TokenTree iterator to avoid a few clones

rust-lang · May 12, 2023 · 05c5df5 · 05c5df5
1 parent 5b24e12
commit 05c5df5
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Showing 3 changed files with 6 additions and 6 deletions.
diff --git a/compiler/rustc_builtin_macros/src/concat_idents.rs b/compiler/rustc_builtin_macros/src/concat_idents.rs
@@ -19,7 +19,7 @@ pub fn expand_concat_idents<'cx>(
  }
 
  let mut res_str = String::new();
- for (i, e) in tts.into_trees().enumerate() {
+ for (i, e) in tts.trees().enumerate() {
  if i & 1 == 1 {
  match e {
  TokenTree::Token(Token { kind: token::Comma, .. }, _) => {}

diff --git a/compiler/rustc_builtin_macros/src/trace_macros.rs b/compiler/rustc_builtin_macros/src/trace_macros.rs
@@ -8,7 +8,7 @@ pub fn expand_trace_macros(
  sp: Span,
  tt: TokenStream,
 ) -> Box<dyn base::MacResult + 'static> {
- let mut cursor = tt.into_trees();
+ let mut cursor = tt.trees();
  let mut err = false;
  let value = match &cursor.next() {
  Some(TokenTree::Token(token, _)) if token.is_keyword(kw::True) => true,

diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
@@ -1882,8 +1882,8 @@ declare_lint_pass!(
 struct UnderMacro(bool);
 
 impl KeywordIdents {
- fn check_tokens(&mut self, cx: &EarlyContext<'_>, tokens: TokenStream) {
- for tt in tokens.into_trees() {
+ fn check_tokens(&mut self, cx: &EarlyContext<'_>, tokens: &TokenStream) {
+ for tt in tokens.trees() {
  match tt {
  // Only report non-raw idents.
  TokenTree::Token(token, _) => {
@@ -1944,10 +1944,10 @@ impl KeywordIdents {
 
 impl EarlyLintPass for KeywordIdents {
  fn check_mac_def(&mut self, cx: &EarlyContext<'_>, mac_def: &ast::MacroDef) {
- self.check_tokens(cx, mac_def.body.tokens.clone());
+ self.check_tokens(cx, &mac_def.body.tokens);
  }
  fn check_mac(&mut self, cx: &EarlyContext<'_>, mac: &ast::MacCall) {
- self.check_tokens(cx, mac.args.tokens.clone());
+ self.check_tokens(cx, &mac.args.tokens);
  }
  fn check_ident(&mut self, cx: &EarlyContext<'_>, ident: Ident) {
  self.check_ident_token(cx, UnderMacro(false), ident);