dart-lang/dart-box2d — pull request #23 by laszlokorte (2013-07-11 15:04:30+00:00)
Title: use lazy attribute initialization instead of initializer lists.

https://github.com/dart-lang/dart-box2d/issues/9

In same cases in which clone(other)-constructors use initializer lists so set the properties I have kept the initializer lists for all constructors.