text: //// [subtypingWithObjectMembersOptionality3.ts]
  // Base property is optional and derived type has no property of that name
  
  interface Base { foo: string; }
  interface Derived extends Base { bar: string; }
  
  interface T {
      Foo?: Base;
  }
  
  interface S extends T {
      Foo2: Derived // ok
  }
  
  interface T2 {
      1?: Base;
  }
  
  interface S2 extends T2 {
      2: Derived; // ok
  }
  
  interface T3 {
      '1'?: Base;
  }
  
  interface S3 extends T3 {
      '1.0': Derived; // ok
  }
  
  // object literal case
  var a: { Foo?: Base; }
  var b: { Foo2: Derived; }
  var r = true ? a : b; // ok
  
  //// [subtypingWithObjectMembersOptionality3.js]
  // Base property is optional and derived type has no property of that name
  // object literal case
  var a;
  var b;
  var r = true ? a : b; // ok
  