[Errors] getter returning private type

[mhegazy]

module m1 {
    export class C2 implements m3.i3 {
        public get p1() {
            return new C1();
        }

        public f55() {
            return "Hello world";
        }
    }
    module m3 {
        export interface i3 {
            f55(): string;
        }
    }
    class C1 { }
}

Expected:

Exported class 'C2' implements private interface 'm3.i3'. Return type of public property getter from exported class has or is using private type 'C1'.
Actual: no error

[sheetalkamat]

Fixed by 2654eed