Fix single line comment lexing with CRLF line ending (#964)

Co-authored-by: tofpie <tofpie@users.noreply.github.com>

boa/src/syntax/lexer/comment.rs

@@ -31,11 +31,11 @@ impl<R> Tokenizer<R> for SingleLineComment {
 
         // Skip either to the end of the line or to the end of the input
         while let Some(ch) = cursor.peek()? {
-            if ch == b'\n' {
+            if ch == b'\n' || ch == b'\r' {
                 break;
             } else {
                 // Consume char.
-                cursor.next_byte()?.expect("Comment character vansihed");
+                cursor.next_byte()?.expect("Comment character vanished");
             }
         }
         Ok(Token::new(

boa/src/syntax/lexer/tests.rs

@@ -41,6 +41,21 @@ fn check_single_line_comment() {
     expect_tokens(&mut lexer, &expected);
 }
 
+#[test]
+fn check_single_line_comment_with_crlf_ending() {
+    let s1 = "var \r\n//This is a comment\r\ntrue";
+    let mut lexer = Lexer::new(s1.as_bytes());
+
+    let expected = [
+        TokenKind::Keyword(Keyword::Var),
+        TokenKind::LineTerminator,
+        TokenKind::LineTerminator,
+        TokenKind::BooleanLiteral(true),
+    ];
+
+    expect_tokens(&mut lexer, &expected);
+}
+
 #[test]
 fn check_multi_line_comment() {
     let s = "var /* await \n break \n*/ x";