Error when using Reflect.construct on ES2015 classes

[not-an-aardvark]

var Reflect = require('harmony-reflect')

var Foo = class{}

Reflect.construct(Foo, [])

This throws the following error:

TypeError: Class constructors cannot be invoked without 'new'
    at new <anonymous> (path/to/harmony-reflect/test/testReflect.js:313:19)
    at Object.global.Reflect.construct (path/to/harmony-reflect/reflect.js:1976:43)
    at path/to/harmony-reflect/test/testReflect.js:325:29
    at test (path/to/harmony-reflect/test/testReflect.js:328:4)
    at Object.<anonymous> (path/to/code/harmony-reflect/test/testReflect.js:333:3)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)