Type inference broken for this in master

[MaceWindu]

module Bug {
    export class BugClass {
        public fail(): void {
            var x = this;
            x = x.getself(); // error TS2322: Type 'BugClass' is not assignable to type 'this'.
        }

        public getself(): BugClass {
            return this;
        }
    }
}

[MaceWindu]

Looks like it's due to this feature #4910. Gonna read it carefully - not sure wether it expected behavior or not.

[MaceWindu]

ok, looks like its expected behavior...