text: // @flow
  
  () => ({
    ab: null, "a b": null, "a'b": null,
    "1": null, "'": null, " ": null,
    "_": null, "": null,
    get "x"() {return null; },
    set "y"(z: string) {}});
  
  () => ({
    ab: null, 'a b': null, 'a"b': null, '1': null, '"': null, ' ': null, '_': null, '': null,
    get 'x'() {return null;}, set 'y'(z: string) {} } );
  