[Errors] No error using unexported type from module inside an exported type

[mhegazy]

Code:

    module Editor {
            export class Buffer {
            lines: List<string>;
        }
        class List<T> {         }
    }

Expected: Error (on 'lines': List is not exported)
Actual: No error

[sheetalkamat]

Fixed by 00b4c2e