__proto__ is not in completion list correctly

[sheetalkamat]

////module M {
////    export interface /*1*/__proto__ {}
////}
////var /*2*/__proto__: M.__proto__;
/////*3*/
////var /*4*/fun: (__proto__: any) => boolean;

goTo.marker('3');
verify.completionListContains("proto", "(var) proto: M.proto", "");

Completion list at 3 fails and the entry in the completion list is _proto instead of just proto
edit.insert("proto");
goTo.definition();
verify.caretAtMarker('2');

Also goto definition currently fails

tests\cases\fourslash_old\proto.ts

(moving this to tests\cases\fourslash\proto.ts as part of changes to quickInfo)