Hello,
Like Scala, Xtend allows to omit "obvious" semicolons. Of course, this can lead to ambiguity in some corner cases. Scala-IDE has added a button to show/hide inferred semicolons, much like Eclipse's button to show/hide whitespace:

In the attached image, the first and third import statements omit the semi-colon, whereas the second one explicitly has a semi-colon. I think, such a button would be useful for Xtend as well...
Cheers
Lukas