text: //// [typeAssertionToGenericFunctionType.js]
  var x = {
      a: (function (x) {
          return 1;
      }),
      b: function (x) {
          x;
      }
  };
  x.a(1); // bug was that this caused 'Could not find symbol T' on return type T in the type assertion on x.a's definition
  x.b(); // error
  