TypeScript bug report, http://typescript.codeplex.com/workitem/131

gistfile1.js

/*
Bug:
TypeScript compiler should generate a *fresh* variable name for a lexically captured this pointer.

For example, in the lambda assigned to window.onmousemove shown below, the captured outer this-pointer 
should not be named "_this" since it would clash with an existing local variable, but instead should
be given a name that is not in scope, e.g. "_this2".


Tested in:
http://www.typescriptlang.org/Playground/
*/

class Tracker {
	count = 0;
	start() {
		var _this = 0;
		window.onmousemove = e => {
			this.count++;
			console.log(this.count * _this);
		}
	}
}

var t = new Tracker();
t.start();