When using locals which haven’t been properly initialized, the generated JS simply fails on trying to access properties on null. This is kind of hard to detect (until you’ve seen it a few times) and to deduce. Something of a warning might come in very handy, here.

Submitted by Meinte Boersma on 13 March 2011 at 13:11

An error will be triggered for null initialized variables (without type specifications) in 0.4.1.