scala comment compile error

a.scala

// \r\n a ==> ok
// \u000D\u000A b ==> compile error

output.txt

~/sand $ scala a.scala
/Users/matsu_chara/sand/a.scala:2: error: not found: value b
// \u000D\u000A b ==> compile error
                ^
/Users/matsu_chara/sand/a.scala:2: error: not found: value compile
// \u000D\u000A b ==> compile error
                      ^
two errors found