Decorator on class expression

[BurtHarris]

I hit an snag porting a unit test from Babel to TypeScript. I'm not following the decorator spec closely, so it might be as-intended, but I thought I'd ask.

TypeScript Version: 2.3.2

import mixin from '../../lib/mixin';

function applyMixins(...mixins) {
  return @mixin(...mixins)
    class Foo {
      getStuff3() {
        return 'stuff3';
      }
    };
}

Expected behavior:
Compiles as under Babel

Actual behavior:
This fails with an Expression expected error

[aluanhaddad]

This is a duplicate of #7342.

[BurtHarris]

Thanks