Dart Plugin - no code completion

I don't know if this is a bug yet, so I figured I would ask here first.

I just started using the Dart plugin, and I cannot for the life of me figure out how to get code completion to work. The behavior is illustrated here:

library test;

import 'dart:html';

main() {
  Element elem = querySelector('main-search');
  elem. //should give syntax suggestions, instead gives "no suggestions"
}

Note that the above code runs in a properly setup Dart module, inside a larger Web project. I have also tried creating variables of other types, including built-in ones such as String. The behavior is always the same.

I have everything up to date, including the latest Dart SDK. I have gone through all the Dart plugin settings I could find, but there seems to be nothing to do there.

How can I get the completion to work?