JSTests/es6/object_literal_extensions_computed_accessors.js

function test() {

var x = 'y',
    valueSet,
    obj = {
      get [x] () { return 1 },
      set [x] (value) { valueSet = value }
    };
obj.y = 'foo';
return obj.y === 1 && valueSet === 'foo';
      
}

if (!test())
    throw new Error("Test failed");