The Dart libraries continue to evolve, with a new round of methods turning into getters. Florian Loitsch posted this notice to the Dart mailing list:
As of r14094 Map.getKeys() has been changed to Map.keys, Map.getValues() to Map.values, and Match.start()/end()/groupCount() have been made getters.
myMap.getKeys() is now myMap.keys.
myRegExp.firstMatch("foo").start() is now myRegExp.firstMatch("foo").start.