Revert legacy

Author: CPunisher

crates/swc_ecma_lexer/src/lexer/comments_buffer.rs

@@ -25,6 +25,10 @@ impl CommentsBuffer {
             pending_leading: OneDirectionalList::new(),
         }
     }
+
+    pub fn take_pending_leading(&mut self) -> Rev<IntoIter<Comment>> {
+        self.pending_leading.take_all()
+    }
 }
 
 impl CommentsBufferTrait for CommentsBuffer {

crates/swc_ecma_lexer/src/lexer/state.rs

@@ -11,7 +11,7 @@ use crate::{
         input::Tokens,
         lexer::{
             char::CharExt,
-            comments_buffer::{BufferedCommentKind, CommentsBufferTrait},
+            comments_buffer::{BufferedComment, BufferedCommentKind, CommentsBufferTrait},
             state::{
                 State as StateTrait, TokenKind as TokenKindTrait, TokenType as TokenTypeTrait,
             },
@@ -870,7 +870,13 @@ impl Iterator for Lexer<'_> {
         let span = self.span(start);
         if !matches!(token, Token::Eof) {
             if let Some(comments) = self.comments_buffer.as_mut() {
-                comments.pending_to_comment(BufferedCommentKind::Leading, start);
+                for comment in comments.take_pending_leading() {
+                    comments.push_comment(BufferedComment {
+                        kind: BufferedCommentKind::Leading,
+                        pos: start,
+                        comment,
+                    });
+                }
             }
 
             self.state.update(start, token.kind());