---input---
  // this is a line-ending comment
 //* embed a bock comment start, after a space
// /* embed a bock comment start, v2

---tokens---
'  '          Text.Whitespace
'// this is a line-ending comment\n' Comment.Single

' '           Text.Whitespace
'//* embed a bock comment start, after a space\n' Comment.Single

'// /* embed a bock comment start, v2\n' Comment.Single