- any unicode line break (line feed, vertical tab, form feed, carriage
return, NEL, LS and PS) is considered to terminate a single-line
comment. The line break itself is considered to be the next token
after the comment, leading to a parser error if it is not an
ascii character (i.e. for NEL, LS and PS).
- unterminated multiline comments are considered illegal tokens
- '/** /' is considered an unterminated multiline comment
(previously, whitespace was allowed before the last '/'
