https://github.com/BUAA-SE-Compiling/c0-handbook/blob/5173fad3737167acda7719b4ff82be80d9ba6eb9/c0-grammar.txt#L60 ``` <single-line-comment> ::= '//'{<any-char>}<LF> ``` 此处只有LF https://github.com/BUAA-SE-Compiling/c0-handbook/blob/5173fad3737167acda7719b4ff82be80d9ba6eb9/README.md#L562 ``` <single-line-comment> ::= '//' {<any-char>} (<LF>|<CR>) ``` 此处为CR或LF
