Compile error in common_prelude.js

r276, in common_prelude.js file:

In the set_from_poly function, as below (error is on line 6):

CollisionPoly_.prototype.set_from_poly = function (r)
{
	this.pts_count = r.pts_count;
	cr.shallowAssignArray(this.pts_cache, r.pts_cache);
	this.bboxLeft = r.bboxLeft;
	this.bboxTop - r.bboxTop;
	this.bboxRight = r.bboxRight;
	this.bboxBottom = r.bboxBottom;
};

this.bboxTop = r.bboxTop; //ie equals not minus

Thanks Ashley - Wow, that's a long time! I only found out by trying to debug one of my plugins that wasn't compatible with the closure compiler, so I put the exported runtime.js through the online minifier and the code analyser identified it.