Fix unchecked.

Do not duplicate data size checking.

src/token.rs

@@ -1095,7 +1095,7 @@ pub fn parse_string_literal(
 
         match next_char {
             // \r - ignore if followed by \n
-            '\r' if stream.peek_next().map(|ch| ch == '\n').unwrap_or(false) => {}
+            '\r' if stream.peek_next().map(|ch| ch == '\n').unwrap_or(false) => (),
             // \...
             '\\' if !verbatim && escape.is_empty() => {
                 escape.push('\\');